0 used to say that a particular thing can or will happen only after something else happens or becomes true:
We'll have the party in the garden if the weather's good. If not (= if the weather is not good), it'll have to be inside.
If anyone calls, just say I'll be back in the office at four o'clock.
If she hadn't called, I wouldn't have known.
I wouldn't work for them (even) if they paid me twice my current salary.
If disturbed, the bird may abandon the nest, leaving the chicks to die.
1 used to introduce a clause, often in indirect speech, that shows two or more possibilities:
4 used to say that a particular thing can or will happen when, only when, or after something else happens or becomes true:
5 (used to introduce a clause, often when reporting what someone else said) whether:
You have to go to college for a lot of years if you want to be a doctor.
Try to act confidently, even if you feel nervous.
Biscuits will stay crisp if you keep them in an airtight container.
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在那種情況下, 假如,如果, 雖然,即使…
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在那种情况下, 假如,如果, 虽然,即使…
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si, cuando…
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se…
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もし~ならば(条件を表す), もし~ならば(可能性を表す), ~するかどうか…
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...sa/se ... sa/se, eğer, şayet…
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si, chaque fois que, bien que…
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si, quan…
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