I don't can find it和I can't find it的区别
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I don't can find it和I can't find it的区别
I don't can find it和I can't find it的区别
I don't can find it和I can't find it的区别
前面那句话是错的.
情态动词是一种本身有一定的字义,但不能独立充当谓语,必须和动词原形一起构成谓语动词的动词,它们有以下几个特点.
一、情态动词后面一定跟动词原形,如：He can speak English.不能说,He can speaks English.
二、情态动词没有实义动词的各种变化,只有could、might、should、would、was/were to、had to、dared等几个过去式,也就是说它只有两种基本形式,即原形和过去式.比如：不能说He cans speak English.
三、情态动词（have to、used to除外）变成否定式时,只需在后面加上not就可以了,无须借助助动词,如：He can't speak English.
四、情态动词（have to、used to除外）变成疑问句或部分倒装句时,只需把情态动词提到主语之前即可,无须借助助动词,如：
Can he speak English?
Hardly can he speak English.
Only in this way can we master English.
不能说：
Does he can speak English?
Hardly does he can speak English.
Only in this way do we can master English.
五、两个情态动词、情态动词和助动词是不能连用的,只有一部分情态动词可以和助动词be或have连用,例如：
She said,"I couldn't fix your computer yesterday."
这句话变成间接引语时要说：
She said that she hadn't been able to fix my computer the day before.
不能说：
She said that she hadn't could fix my computer the day before.
又如,不能说：
You wil can learn English soon.
要说：
You will be able to learn English soon.
所以你给出的第一句有错,要把情态动词变成否定句时,只需要在情态动词后面加上not就可以了,无须借助助动词,第二句才是正确的,希望我能帮助你解疑释惑.
can是情态动词 do是助动词 不可以连用
前一种明显语法错误
保险起见，我咨询了在美国留学的朋友，他说没有第一种用法。
没有第一种用法……