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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.
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Practice with free spaced repetition flashcards
119 vocabulary decks, unlimited, no account needed.
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.
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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.
Practice with free spaced repetition flashcards
119 vocabulary decks, unlimited, no account needed.