be做謂語(yǔ)，依然是主系表結(jié)構(gòu)

常見(jiàn)構(gòu)成：

肯定句：主語(yǔ) + (was/were) + 表語(yǔ)

Jim was a student three years ago.

否定句：主語(yǔ) +wasn't /weren't+ 表語(yǔ)

Jim wasn't a student three years ago.

一般疑問(wèn)句：Was /Were + 主語(yǔ) + 表語(yǔ)

Was Jim a student three years ago ? Yes ，he was. No，he wasn't.

特殊疑問(wèn)句：特殊疑問(wèn)詞 + 一般疑問(wèn)句

What was Jim three years ago?

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