Compare your answer with those at the back of the book to see if they are right.

问题描述:

Compare your answer with those at the back of the book to see if they are right.
这里compare 为什么只用原型?不用 comparing 或者to compare

因为这是一个祈使句,命令或者期望别人做什么事情的.所以用动词原形.里面的those 为什么不用these?因为这句话是写在问题的地方,而答案是在书末尾,所以是指远处,要用 thosethese,这些,指近出的东西those,那些,指远处的东西