Ⅰ.in time “及时”，指的是不迟到或在提前的时间之前做某事，后面可接不定式或for短语。
Ⅱ.on time“准时”，指按规定的时间或指定的时间做某事，后面不可以跟不定式或for短语。如：
① Joe was just in time for the bus. Joe正好赶上那班汽车。
② They got there on time to see the exhibition. 他们准时到那儿，去看了那个展览。
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