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across,through,over,past的区别

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across,through,over,past的区别
再附上关于这几个词的练习及答案,
across,through,over,past的区别
through / past / across 区别:都可作介词,“穿过”,前常有位移动词(以下黑体部分).
He climbed through the window and saw what he could take away.(从窗户内部经过)
He went past me without saying any words.(从我旁边经过)
He swam across the river.(从河的表面经过)【through,内部; past,旁边; across,表面】
位移动词 + past 有时相当于动词pass; 位移动词 + across有时相当于动词cross.
the number of / a number of:前者“…的数量”;后者“许多的”
都跟可数名词复数.前者作主语,谓语用单数;后者作主语,谓语用复数.
The number of the trees is two thousand.(用单数谓语.另注意trees前有限定词)
A number of trees have been cut down.(用复数谓语.另注意trees前无限定词)
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