I didn’t pretend to understand what he said.
我没有装着听懂了他说的话。
【简析】
动词pretend的否定形式有两种：既可以否定pretend，也可以否定其后的不定式，其含义不同。试比较：
I didn’t pretend to understand what he said.
我没有装着听懂了他说的话。
I pretended not to understand what he said.
我装着没有听懂他说的话。
They didn’t pretend to see me when I went by.
当我经过的时候，他们没有假装看见我。
They pretended not to see me when I went by.
当我经过的时候，他们假装没有看见我。
He didn’t pretend to notice.
他没有假装注意。
He pretended not to notice.
他假装没注意。
以下是经典范例：
She didn’t love him, though she pretended to .
她并不爱他，虽然她装出爱的样子。
The children pretend to be different animals dancing to the music.
孩子们扮成不同的动物，随着音乐起舞。
She pretends to be interested in opera, but it’s only for show.
她做出一副对歌剧感兴趣的样子，但这不过是装门面而已。
Don’t be surprised if I pretend not to recognise you.
要是我假装不认识你，你别觉得奇怪。
《牛津高阶英汉双解词典》
I pretended not to care but I was screaming inside.
表面上我佯装不在乎，但内心却在高声喊叫。
We do not pretend that the past six years have been without problems for us
我们并不自夸在过去的6年中没有遇到问题。
《柯林斯高阶英汉双解学习词典》
Within this lecture I cannot pretend to deal adequately with dreams.
在这一次讲座中，我不敢自诩能对梦境作透彻的分析。
I just pretended not to hear.
我只是假装没听见。
中考真题- 2019 北京 完形填空
另外还有以下三种常见用法：
pretend to be doing sth.假装正在做某事
pretend to have done 假装做过某事
pretend + that从句
I pretend to be sleeping when my parents came in.当他父母进来时他假装正在睡觉。
He pretended to have been abroad.他假装在国外待过。
He pretended to his family that everything was fine.
他对家人佯称一切都好。
We pretended (that) nothing had happened.
我们假装什么事情也没发生。
I pretend that things are really okay when they’re not…
当情况不好的时候我假装一切顺利。
Not even their diehard supporters can pretend that this was a great game.
即使是他们的铁杆支持者也无法假装这是一场精彩的比赛。
We won’t pretend we savour the prospect of a month in prison
我们不会装作我们满心盼望着在监狱中度过一个月。
She pretended she wasn’t excited but the expression on
her face was a dead giveaway.
她假装不为所动，可脸上的表情却将她的心绪暴露无遗。