By the time i got to class,my Englishi teacher had already started teachig

问题描述:

By the time i got to class,my Englishi teacher had already started teachig
这句话中的by the time等于when吗?为什么?

不等于
by 不迟于,在.之前
by the time 到.时候,常和完成式连用
此句如用when,后面的had already started 过去完成时也无立足的基础了
以此句为例,
用when,表示的到达班级的那一瞬间
用by the time 指的是在我到达班级之前,(老师已经开始讲课了)
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