基本用法：
1，pretend to do sth. 假装要做某事
2，pretend to be doing sth.假装正在做某事
3，pretend to have done 假装做过某事
retend一般是加宾语从句和不定式的.
pretend的主要用法（也就是考点）如下：
1）pretend to do sth
该结构有如下三种形式：pretend to do sth（一般式）；prentend to be doing sth（进行式）；prentnd to have done sth（完成式）
如：I pretend to be sleeping when my parents came in.
He pretended to be friendly with me.
He pretended to have been abroad.
2) pretend + that从句
如：He pretended that he was innocent.
3）adj.假装/假想的
如：Don't be afraid of a pretend problem.
