Sep 12, 2026 · 8 min read
A flashcard works when it forces you to produce an answer from nothing. Most cards fail because they turn that into recognition: you read a word, feel a small glow of familiarity, turn the card over and agree with yourself. The routine below builds cards that make you retrieve, spaces the reviews so each one lands just before you forget, and keeps the deck small enough to finish. Used that way, twenty minutes a day beats an hour of highlighting.
One card, one item. A card with a word, its translation, its pronunciation and three example sentences tests four things at once and tells you nothing about which one failed. Put the target on the front, and on the back put the meaning in plain words plus one short sentence that shows the word in a real context. If the word is a vocabulary item from a level list, use the sentence you can picture, not the sentence you copied from a dictionary.
For a word like mitigate, the front is the word alone. The back is the meaning in a few words, then one sentence: insurance can mitigate the loss, not remove it. Notice what is missing: no second definition, no synonym list, no etymology. Those can follow later, on a separate card, once the first one is automatic.
Recognition is the feeling of having seen something before; recall is producing it. Only recall survives into a conversation, where nobody shows you a list to choose from. To pull a card towards recall, reverse the direction: front in your first language or in a definition, back in the target word. Better still, put a gap in the example sentence and ask for the missing word. A deck of English-to-definition cards passes every self-test and then fails in speech, which is why level word lists are worth turning around before you review them.
If you are working through a word list, the keyword mnemonic method gives you something to hang difficult words on, and the guide to collocations explains why a card holding a pair, such as mitigate a risk, is worth more than the noun or verb alone.
Review a new card the same day, then after about a day, then after three days, a week, two weeks, a month. Each successful recall pushes the next review further out; each failure pulls it back in. This is the whole of spaced repetition, and the full reasoning is in our guide to spaced repetition. The practical rule is simple: a card you answered at once moves to the back of the queue and a card you missed comes back within the same session.
Apps handle the scheduling for you, but paper works with a set of dividers marked today, three days, one week and one month. Move each card forward one divider when you answer correctly and back to today when you miss it. What matters is that the interval grows, not that a particular algorithm chose it.
Give every card a real attempt out loud, even when you are certain you do not know it, because the effort of the failed search is part of what fixes the word. Then turn the card, say the answer aloud again, and mark it honestly. A card marked easy when it was a guess will disappear for a week and take the word with it.
Keep the deck's daily limit short enough that you finish. Twenty new cards a day for a month is six hundred cards, far more than most learners can hold; ten new cards with a firm review habit beats thirty abandoned after a fortnight.
When a card fails four or five times, the card is the problem, not you. Three fixes work in the order below. First, cut it down: one meaning per card. Second, add a concrete example sentence that you can picture, and a mnemonic if the word will not stay. Third, move the word into a sentence you write about your own life and keep that card. If it still fails after that, retire it for a fortnight, then rebuild it from scratch rather than reviewing a card that only ever produces a sigh.
Paper suits words you write yourself and cards you review away from a screen. Apps suit large decks, automatic spacing and reviewing on a phone in spare minutes. There is no reason to choose: many learners keep a paper deck for the week's twenty words and an app for the long-term pile. What does not work is starting a second deck with the same words, because you will spend your review time on duplicates.
Week one: ten new cards a day from a level list, each with one sentence, reviewed the same evening. Week two: the same ten cards a day, plus a two-minute pass over everything from week one. Week three: stop adding for two days and clear the backlog, then add ten more. Week four: review only, no new cards, and retire anything that has failed repeatedly. By the end of the month you will have between two and three hundred cards you can actually produce, which is a working vocabulary rather than a collection.
Start from the B1 word list if you are building your first deck, and keep the cards to words you have already met in reading or listening; a card for a word you have never seen in context is a card you will forget on principle.
Fifteen to thirty minutes of review is enough, which usually means sixty to a hundred cards once they are spaced out. Add no more than ten new cards a day, because new cards create future reviews and the pile grows faster than it feels.
Definitions in the target language are better once you can read them easily, because they keep you inside the language. Translations are useful at the start for concrete nouns, and for abstract words a short plain-language definition plus one example sentence usually beats a one-word equivalent.
Handwriting slows you down, which helps you notice the word's shape and spelling, and it suits small weekly decks. Typing is faster and better for long-term collections you review on a phone. Either way, write the example sentence yourself rather than copying one.
That is normal and expected. A first correct answer is weak, which is why the next review falls within a day. Two or three spaced successes are what make a word stay, and the failures in between are the process working rather than evidence that flashcards do not suit you.
Yes, if the card asks for a decision rather than a rule. Put one sentence with a gap on the front and the correct form plus a three-word reason on the back, and review it the same way as a word card. Rule cards that recite the grammar tend to be recognised rather than used.