do sth if .在假设条件成立时就.的意思 例如：Leave here if the train comes.如果火车来了就走.（火车没来的话可能就走不成）do sth when.两种情况：1、到指定的时候就.2、当什么条件成熟时就.Tell him the truth w...
do sth if ···和do sth when怎么用
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