can的否定形式是can't或can not。can情态动词、名词、动词,作情态动词时意为“.能;能够;有机会;可能;被允许”,作名词时意为“圆柱形金属容器;罐头。
1.can是情态动词后面跟动词原形。例如Can you help me+to do sth (不定式).Can you help me+do sth (原型)。
2.含有情态动词can的否定句:在情态动词can后面加not,否定式为can not=can’t。
“主语+情态动词+动词原形+其他”
I can not play sports.我会体育运动。
She can speak Chinese.她会说汉语。
If you can use a word correctly and effectively, you comprehend it.你如果能正确和有效地使用一个字,你就了解它了。
He's much better and can get up now.他好多了,能下床了。
When can I get my test results?
我什么时候可以拿到化验结果?
We can reduce the problem to two main issues.
我们可以将这个问题概括成两个要点。
The operation could prolong his life by two or three years.
这次手术可使他多活两三年。