How to tell them apart
と describes a natural, automatic or habitual result that follows inevitably, while たら is a general conditional for one time or hypothetical events. The main clause after と cannot express a command, request or intention, so 嫌いだったら残して下さい is fine but 嫌いだと残して下さい is wrong. Unlike たら, と cannot describe a specific past one time event, so 先生に聞いたらすぐ分かった is natural but 先生に聞くとすぐ分かった is unnatural for a single past occasion.
- と Use と to describe a result that follows naturally or automatically from the condition.
- たら Use たら to describe a one time if or when condition including requests and volitional actions.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| と to | if/when something happens, leading to an expected outcome | N4 |
| たら tara | used for 'if' or 'when' conditions | N4 |
と to
if/when something happens, leading to an expected outcome
と expresses that whenever the condition before it happens, the result after it follows naturally or inevitably, like a rule of nature, a machine function, or a habitual outcome. It attaches to the plain non-past form of verbs and i-adjectives, as in 押すと or 安いと, and to nouns and na-adjectives with だと, as in 春だと. The result clause cannot contain a command, request, or intention such as てください or ましょう, since the outcome must be beyond the speaker's control.
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三に二を足すと五になる。
Add two to three, and you get five.
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冬が来ると、とても寒くなりますね。
When winter comes, it'll become really cold, right?
たら tara
used for 'if' or 'when' conditions
たら marks an if or when condition where the main event follows realization of the condition, and it covers likely future cases, hypothetical wishes, and past counterfactuals. Attach ら to the plain past form, as in 行ったら, 高かったら, and 静かだったら or 学生だったら for na-adjectives and nouns. It is neutral and very common in speech, but remember to use the た form even for future meaning, never the dictionary form before ら.
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行きたいんだったら、行ってもいいよ。
You can go if you want to.
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後２分早かったら、バスに乗れたのに。
If you had come only two minutes earlier, you could have caught the bus.
と and たら are both JLPT N4 grammar points that Japanese learners often mix up. This page compares them side by side on meanings, usage and example sentences, so you can tell them apart.