At schoo,our teaches do all they can to help us with our lessons竭尽全力做.do all they can 是怎么回事,can后是什么
问题描述：
At schoo,our teaches do all they can to help us with our lessons
竭尽全力做.do all they can 是怎么回事,can后是什么
答
At school ,our teaches do sth. to help us with our lessons
sth. =(all they can)
这样句子结构就清楚了。
do all (that ) they can (do)
这是个宾语从句，省略了不少东西。
答
can 后面的 do 被省略了
答
all they can是前面do的定语从句,和后面的to help us不是在一起的.
can后面应该接动词原形.