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if; when
and
with
used for quoting (thoughts, speech, etc.)
promoted pawn
indicates a question
春になると庭に色とりどりの花が咲きます。
When spring comes, flowers bloom.
スイッチのボタンを押すと機械が動き出す。
When you press the button, it starts moving.
雨が降ると道が濡れて滑りやすくなります。
When it rains, the road always gets wet.