Question

I stayed at home yesterday.（改为否定句） I （ ）（ ）at home yesterday。

Answer 1

I didn't stay at home yesterday.
从句子上可以看到“stayed”，这个词是过去分词（就是这个动作生在过去，所以要在动词后加ed），而且这个句子还可以写成 I did stay at home yesterday.

当要变成否定句的时候，就要在
“did” 后面加“not ”， 所以句子就变成了 I did not stay at home yesterday。因为只有两个括号，所以把did not 简写成 didn‘t， 所以正确答案就是I didn't stay at home yesterday.

Answer 2

I didn't stay at home yesterday.
因为stayed是过去式 所以找过去助动词did 加not构成否定

Answer 3

I didn't stay at home yesterday.