I ___(be) sick at home yesterday.

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I ___(be) sick at home yesterday.

I ___(be) sick at home yesterday.
I ___(be) sick at home yesterday.

I ___(be) sick at home yesterday.
拿到一个句子,首先看它的时态,这里的yesterday说明是过去时态;其次生病这个短语应该是be sick,所以be 可以是 was 或是 were.但应题目中有主语 I,所以选择用 was. Do you understand? If you don't, please contact me.

was
过去式、而且主语是I

was,am的过去式是“was”,和is的过去式是一样的