by the time of last term ,we have finish all the lessons

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/21 08:14:26

by the time of last term ,we have finish all the lessons
we had invented many new things by the time of last years
两个句子都是by the time ,主句的时态为什么不同?

第一个句子【by the time of last term ,we have finish all the lessons】错误,正确的表达是：
By the time of last term ,we had finished all the lessons.
by the time of 表示“到...的时候”,句意是：在上个学期为止,我们已经学完了所有的课程.这里需要用过去完成时态,其结构是：had + 过去分词.过去完成时指：某一动作在过去某个时间或者动作之前发生,即发生的时间是“过去的过去”.有关过去完成时的定义、用法请参考：http://baike.baidu.com/view/201153.htm
第二个句子【we had invented many new things by the time of last years】,其实,也有一点小错误.正确的是：We had invented many new things by the time of last year.
这里的years不需加S.具体的解析请参考上面的.

by the time of last term ,we have finish all the lessons The teacher said we __ ten lessons by the end of this term By the end of this term we____ten English lessons the end of this term we ___ten English lessons We have finished all the lessons.It is time for us to r___ t We ___(be) to three countries by the end of last term. By the end of last term,we _____ about twenty English songs By the end of this term,we __6000 English words in all. by the time you finish your homework,all of us ------ ours a 是by last term还是 by the last term 6.________ of last term,we had learned ten lessons. I _____1000 english words by the end of last term