feign、pretend与simulate这些动词均有“假装”之意。
feign常和pretend换用，一般指言行上的“装做，假装”如装无知、悲哀；装死、疯或装做睡眠等。
You know how everyone feigns surprise when you tell them how old you are.
你知道当你告诉别人你的年龄时，他们如何故作惊讶。
The prosecution claimed that the defendant had feigned the injury.
原告代理律师称被告的伤是伪装的。
She responded to his remarks with feigned amusement.
她对他的话假装感兴趣。
pretend : 指公开表示的与心里想的与客观实际不符合，含公开承认其虚假的意味。
He pretended (that) he didn't mind, but I knew that he did.
他假装不在乎，但我知道他很介意。
The children pretended (that) they were dinosaurs.
孩子们装扮成恐龙。
Were you just pretending to be interested?
你只是在假装感兴趣吗？
She's not really hurt - she's only pretending.
她并不是真的受了伤——她只是在装。
Of course I was angry - I can't pretend otherwise.
我当然生气了——怎么可能会是装的。
simulate : 主要指模仿他人或他物的样子，假装具有他人或他物的特点。
In cheap furniture, plastic is often used to simulate wood.
廉价家具经常用塑料模仿木材。
Ruth simulated pleasure at seeing Sam, but really she wished he hadn't come.
看见山姆，露丝假装很高兴，可实际上她希望他没来。
The computer simulates (= represents) different road conditions for new drivers to practise on.
计算机模拟不同的路况供学习者练习。