第1个回答 2011-05-16
同义句是：
It's been two years since we came to study at this school。
意思就是我们两年前加入到学校的，所以是原句的同义句。
第2个回答 2011-05-16
It's two years ago that we came to study at this school.
原句是一个现在完成时态，强调的是对现在的影响。
改为有It is。。。that。。。引导的强调句型。
第3个回答 2011-05-16
two years ago when
It's two years ago when we came to sudy at this school.
由现在完成时的叙述变为一般过去时的叙述
第4个回答 2011-05-16
It's been two years since we came to study at this school
自从我们来这个学校已经两年了
O(∩_∩)O！
第5个回答 2011-05-16
It's been_ two years since_ _ _we came to study at this school