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Flashcards to Learn English: How to Use Them So They Actually Work
Flashcards only work if you use spaced repetition: reviewing everything at once doesn't help, you need to review right before you forget.
Written by Bryan López, Profesor de inglés · Updated
Flashcards to learn English work when you use spaced repetition: a system that schedules each word's review right before you're about to forget it, instead of reviewing the whole deck at once. Without that system, flashcards are just cards with words you memorize for a bit and forget within a week.
Why regular flashcards don't work well
Reviewing a full deck of flashcards in the same order, over and over, makes you memorize the order of the cards more than the actual meaning of each word. You also spend the same amount of time on words you already know and words you constantly forget, when you should focus more on the latter.
What spaced repetition is and why it changes everything
Spaced repetition is a technique that increases the time between reviews as you master a word: if you remember it well, you see it again in a week; if you struggle, you see it again the next day. It's based on how long-term memory actually works and multiplies how much vocabulary you retain compared to reviewing everything equally.
How many new words to review per day
No more than 15-20 new words per session. Learning too many at once overloads your memory and makes similar words blur together. It's better to keep sessions short and consistent (10-15 minutes a day) than to cram occasionally.
The most common mistake: just reading the card without self-grading
Flipping the card and thinking "yeah, I knew that" isn't enough: you need to honestly rate how well you remembered it, because that determines when you'll see it again. Another common mistake is not combining modes: only reviewing visual flashcards without also practicing writing or listening to the word means you recognize it, but can't actually use it.
Practice with free spaced repetition flashcards
119 vocabulary decks, unlimited, no account needed.
Make better cards: one idea per card
A good flashcard tests one single idea. Instead of putting a long definition on the back, use a short translation or a simple English explanation and one example sentence. "Borrow: to take something and return it later. Can I borrow your pen?" The example sentence matters the most, because it shows the word in context and teaches you how it really works in a sentence.
Good cards and weak cards
Use all your senses: read, say, and write
Reading the card silently trains only recognition. To use a word in a conversation, you also need to say it and write it. After you flip a card, say the word and the sentence out loud, and once a week write five words from memory. Listening to the audio of the word makes your pronunciation and listening skills improve at the same time, not only your vocabulary.
A simple 10 minute routine
- Minute 1 to 2: look at yesterday's words and rate them honestly.
- Minute 3 to 7: learn a few new words with their example sentence.
- Minute 8 to 9: say three of the new sentences out loud.
- Minute 10: write one sentence of your own using a new word.
Card design mistake
Incorrect
Card front: run. Card back: correr, dirigir, funcionar, postularse, fluir.
Correct
Card front: run. Card back: to move fast on foot. I run every morning.
Frequently asked questions
Do flashcards actually work for learning English?
Yes, but only if you use spaced repetition. Reviewing a full deck without that system makes you memorize the order of the cards, not the actual meaning of each word.
What is spaced repetition?
It's a technique that schedules your reviews right before you're about to forget a word, increasing the time between reviews as you master it. It multiplies how much vocabulary you retain long-term.
How many new words should I learn per day with flashcards?
No more than 15-20 per session. Learning too many at once overloads your memory and makes similar words blur together.
Are physical flashcards better than an app?
An app with automatic spaced repetition is more efficient because it calculates when you need to review each word for you. With physical cards, you'd have to track that manually.
What is the most common mistake when using flashcards?
Just reading the card and thinking "yeah, I knew that" without honestly rating how well you remembered it. It also helps to combine modes (seeing, writing, listening to the word) instead of only reviewing visually.
Do free flashcards work as well as paid ones?
Yes, if they use real spaced repetition. What determines whether they work is the method, not whether you paid for them.
Should I translate words or use English definitions?
At the beginning, a short translation is fine. As your level improves, try simple English definitions and examples, because they help you think in English instead of translating every time.
When is the best time of day to review flashcards?
Whenever you can be consistent. Many people like the morning, and others do a short review in the evening. Pick the time you will actually keep.
Practice with free spaced repetition flashcards
119 vocabulary decks, unlimited, no account needed.
Keep learning
- How to Learn English for Free From Scratch: A Real Beginner's GuideYou don't need to pay to get started: you need a method, consistency, and practice across all 4 skills, not just isolated grammar rules.
- English Suffixes: What They Are, Types, and a List With ExamplesA suffix goes at the end of the word and can change its part of speech: happy (adjective) becomes happiness (noun).
- False Cognates in English and Spanish: What They Are, With ExamplesA false cognate is a word that looks like a word in the other language but means something completely different, like embarrassed and embarazada.