Question

同义句转换 we have studied at this school for three years.

three years has [ ] since we [ ] to study at this school.

Answer 1

1. 这句话是使用for短语的典型的现在完成时的句子，for是标志词，表示时间的延续，体现现在完成时表示在现阶段的一段时间内延续的动作的含义。和for短语相当，也能体现时间的延续性的介词是since，不过since要求它后面的跟的时间是过去的一个时间点。

2. 综上所述，这句话可改写为：

   We have studied at this school since three years ago.我们在这所学校学习有三年时间了。

Answer 2

Three years has [ passed ] since we [ came ] to study at this school.

望采纳！谢谢！

Answer 3

passed came