do () don't () dose not doesn't is () isn't () cannot () 写出单词的不同变化形式

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do () don't () dose not doesn't is () isn't () cannot () 写出单词的不同变化形式
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do () don't () dose not doesn't is () isn't () cannot () 写出单词的不同变化形式
do () don't () dose not doesn't is () isn't () cannot () 写出单词的不同变化形式

do () don't () dose not doesn't is () isn't () cannot () 写出单词的不同变化形式
do 助动词原形(第一、二人称及复数时使用) ;实意动词原形
-> did
don't 助动词原形的否定形式(第一、二人称及复数时使用)
-> didn't
doesnot doesn't 助动词原形的第三人称单数形式
-> didnot didn't
is 系动词
-> was
isn't 系动词的否定形式
-> wasn't
cannot 情态动词的否定形式
-> couldnot

did
didn't
dosen't
wasn't
coudn't

啥意思啊 问题看不懂啊