CAN = habilidad o posibilidad en PRESENTE y PASADO (could). BE ABLE TO = alternativa necesaria cuando CAN no puede aparecer: futuro ("will be able to"), presente perfecto ("have been able to"), con otro modal ("might be able to"), infinitivo ("to be able to"), gerundio ("being able to"). En presente, CAN y BE ABLE TO son intercambiables para habilidad.
CAN: modal defectivo para habilidad, posibilidad, permiso, o peticion educada. PRESENTE: "She can speak three languages." PASADO: COULD (habilidad general en el pasado): "When I was young, I could run very fast." CAN NO puede usarse en: (1) FUTURO: NUNCA "will can" = usar "will be able to." (2) PRESENTE PERFECTO: NUNCA "have canned" o "have could" = usar "have been able to." (3) TRAS OTRO MODAL: NUNCA "might can" / "should can" = usar "might be able to" / "should be able to." (4) INFINITIVO: NUNCA "to can" = usar "to be able to." (5) GERUNDIO: NUNCA "canning" = usar "being able to." COULD para pasado general vs. WAS/WERE ABLE TO para logro especifico: "She COULD swim" (habilidad general en el pasado). "She WAS ABLE TO swim to safety" (lo logro en una situacion especifica). Para un logro puntual negativo, ambos son posibles: "She couldn't / wasn't able to open the file."
The platform can process up to ten thousand transactions per second under normal operating conditions, which significantly exceeds the peak demand levels recorded during last year's busiest trading periods.
La plataforma puede procesar hasta diez mil transacciones por segundo en condiciones normales de funcionamiento, lo que supera significativamente los niveles maximos de demanda registrados durante los periodos de mayor actividad del año pasado.
When the company was founded, the founding team could operate from a single shared office space, but growth over the past three years has made a larger facility not just preferable but operationally essential.
Cuando se fundo la empresa, el equipo fundador podia operar desde un unico espacio de oficina compartido, pero el crecimiento de los ultimos tres años ha hecho que unas instalaciones mas grandes sean no solo preferibles sino operativamente esenciales.
The current system can integrate with most major enterprise resource planning platforms through standard API connections, reducing the implementation time required for new enterprise clients by an estimated forty percent.
El sistema actual puede integrarse con la mayoria de las principales plataformas de planificacion de recursos empresariales a traves de conexiones API estandar, lo que reduce el tiempo de implementacion requerido para los nuevos clientes empresariales en un cuarenta por ciento estimado.
BE ABLE TO: construccion perifrAstica equivalente a CAN para habilidad/posibilidad, pero gramaticalmente flexible porque se conjuga en TODOS los tiempos y acepta combinaciones. FUTURO: "will be able to" = "Applicants will be able to submit their documents online." PRESENTE PERFECTO: "have/has been able to" = "We have been able to complete the first phase ahead of schedule." PASADO PERFECTO: "had been able to" = "The team had been able to finalize the proposal before the deadline." CON MODAL: "might/may/should/must/could + be able to" = "You might be able to reschedule the meeting." INFINITIVO: "to be able to" = "It would be helpful to be able to access the files remotely." GERUNDIO: "being able to" = "Being able to work remotely has transformed the industry." DIFERENCIA EN PASADO: COULD = habilidad general/repetida en el pasado ("She could play the piano"). WAS/WERE ABLE TO = logro especifico en el pasado ("She was able to finish the presentation in time"). DIFERENCIA CONNOTATIVA: BE ABLE TO = ligeramente mas formal que CAN en el presente.
Once the regulatory approval process has been completed, the company will be able to launch the product across all target markets simultaneously, rather than pursuing the phased rollout that had originally been planned.
Una vez completado el proceso de aprobacion regulatoria, la empresa podra lanzar el producto en todos los mercados objetivo de forma simultanea, en lugar de seguir el lanzamiento por fases que se habia planificado originalmente.
The engineering team has been able to reduce the system's energy consumption by approximately thirty percent without compromising processing speed, which represents a significant achievement given the technical constraints involved.
El equipo de ingenieria ha logrado reducir el consumo energetico del sistema en aproximadamente un treinta por ciento sin comprometer la velocidad de procesamiento, lo que representa un logro significativo dadas las limitaciones tecnicas implicadas.
Being able to access real-time performance data has fundamentally changed how the operations team makes resource allocation decisions and responds to emerging bottlenecks within the supply chain.
Poder acceder a datos de rendimiento en tiempo real ha cambiado fundamentalmente la forma en que el equipo de operaciones toma decisiones de asignacion de recursos y responde a los cuellos de botella emergentes en la cadena de suministro.
Error frecuente
LOS ERRORES MAS FRECUENTES: (1) USAR CAN EN FUTURO: "I will can attend the meeting" = INCORRECTO. "I will be able to attend" = CORRECTO. (2) USAR CAN CON PRESENTE PERFECTO: "I have could finish it" o "I have canned" = ambos INCORRECTOS. "I have been able to finish it" = CORRECTO. (3) USAR CAN CON OTRO MODAL: "You might can reschedule" = INCORRECTO. "You might be able to reschedule" = CORRECTO. (4) USAR COULD PARA UN LOGRO ESPECIFICO EN EL PASADO (POSITIVO): "Yesterday she could finish the report on time" = INCORRECTO (COULD no se usa para logros especificos pasados positivos). "Yesterday she was able to finish the report on time" = CORRECTO. NEGATIVO: "She couldn't finish it in time" = CORRECTO (la negacion si permite COULD para logros especificos). (5) USAR "TO CAN": "She wants to can speak English fluently" = INCORRECTO. "She wants to be able to speak English fluently" = CORRECTO.
Truco para recordarlo
REGLA SIMPLE: ¿Puedes poner un tiempo verbal O un modal ANTES de la habilidad? = usa BE ABLE TO. Futuro: WILL + be able to (no "will can"). Perfecto: HAVE + been able to (no "have canned"). Modal: MIGHT/SHOULD/MUST + be able to (no "might can"). Infinitivo: TO + be able to (no "to can"). Gerundio: BEING + able to (no "canning"). En PRESENTE SIMPLE y PASADO SIMPLE (could), CAN es preferible por ser mas corto. En el pasado, logro ESPECIFICO positivo = WAS/WERE ABLE TO (not could). Logro especifico NEGATIVO = couldn't o wasn't able to (ambos aceptados).
Regla rápida
CAN = habilidad en presente (can) y pasado (could). NO vale en futuro, perfecto, ni tras modal. BE ABLE TO = habilidad en CUALQUIER tiempo. Futuro = "will be able to." Perfecto = "have been able to." Modal = "might be able to." Infinitivo = "to be able to." Logro especifico pasado POSITIVO = was/were ABLE TO (no could). NEGATIVO = couldn't o wasn't able to (ambos ok).
¿Sabías que...?
CAN es uno de los verbos MAS antiguos del ingles — su raiz germanica se remonta al protogermanico *kunnan (saber como hacer algo). En el ingles antiguo (Old English), "cunnan" significaba "saber/conocer" (no simplemente "poder fisicamente"), de ahi que en espanol la traduccion sea a veces "saber" ("She can play piano" = "sabe tocar el piano") y otras veces "poder" ("Can you help me?" = "¿Puedes ayudarme?"). El hecho de que CAN sea un modal DEFECTIVO (sin infinitivo, sin gerundio, sin formas compuestas) refleja que historicamente era un PRETERITO-PRESENTE: una forma de pasado fuerte que con el tiempo adquirio significado de presente. Por eso "could" (su forma de pasado) es en realidad el preterito de "can" que ha sobrevivido. Esta es la razon linguistica por la que necesitamos BE ABLE TO para todos los contextos gramaticales donde CAN no puede aparecer.
Ejercicio 1 · Elige la correcta
The legal team has confirmed that, once the new data protection framework is formally ratified, the company _____ collect and process customer data across all EU member states under a single consolidated consent mechanism.
Ejercicio 2 · Elige la correcta
Despite the significant technical challenges encountered during the migration, the IT department _____ transfer all critical data to the new cloud platform before the scheduled maintenance window closed.
Ejercicio 3 · Forma la palabra
CAN = habilidad en presente (can) y pasado (could). NO vale en futuro, perfecto, ni tras modal. BE ABLE TO = habilidad en CUALQUIER tiempo. Futuro = "will be able to." Perfecto = "have been able to." Modal = "might be able to." Infinitivo = "to be able to." Logro especifico pasado POSITIVO = was/were ABLE TO (no could). NEGATIVO = couldn't o wasn't able to (ambos ok).
LOS ERRORES MAS FRECUENTES: (1) USAR CAN EN FUTURO: "I will can attend the meeting" = INCORRECTO. "I will be able to attend" = CORRECTO. (2) USAR CAN CON PRESENTE PERFECTO: "I have could finish it" o "I have canned" = ambos INCORRECTOS. "I have been able to finish it" = CORRECTO. (3) USAR CAN CON OTRO MODAL: "You might can reschedule" = INCORRECTO. "You might be able to reschedule" = CORRECTO. (4) USAR COULD PARA UN LOGRO ESPECIFICO EN EL PASADO (POSITIVO): "Yesterday she could finish the report on time" = INCORRECTO (COULD no se usa para logros especificos pasados positivos). "Yesterday she was able to finish the report on time" = CORRECTO. NEGATIVO: "She couldn't finish it in time" = CORRECTO (la negacion si permite COULD para logros especificos). (5) USAR "TO CAN": "She wants to can speak English fluently" = INCORRECTO. "She wants to be able to speak English fluently" = CORRECTO.
REGLA SIMPLE: ¿Puedes poner un tiempo verbal O un modal ANTES de la habilidad? = usa BE ABLE TO. Futuro: WILL + be able to (no "will can"). Perfecto: HAVE + been able to (no "have canned"). Modal: MIGHT/SHOULD/MUST + be able to (no "might can"). Infinitivo: TO + be able to (no "to can"). Gerundio: BEING + able to (no "canning"). En PRESENTE SIMPLE y PASADO SIMPLE (could), CAN es preferible por ser mas corto. En el pasado, logro ESPECIFICO positivo = WAS/WERE ABLE TO (not could). Logro especifico NEGATIVO = couldn't o wasn't able to (ambos aceptados).
Bryan López
Fundador de SpeakUP Academy