基本用法：
1，pretend to do sth. 假裝要做某事
2，pretend to be doing sth.假裝正在做某事
3，pretend to have done 假裝做過某事
retend一般是加賓語從句和不定式的.
pretend的主要用法（也就是考點）如下：
1）pretend to do sth
該結構有如下三種形式：pretend to do sth（一般式）；prentend to be doing sth（進行式）；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從句
如：He pretended that he was innocent.
3）adj.假裝/假想的
如：Don't be afraid of a pretend problem.
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