肯定句變為否定句

技巧1：

當句中含有情態動詞或助動詞could，would，should等時，可直接在其后面加not構成否定句。例如：

I could get you a concert ticket. → I could not / couldn't get you a concert ticket.

技巧2：

當句中含有系動詞was，were 時，可直接在其后加not構成否定句。例如：

I was on the Internet when you called me. → I was not / wasn't on the Internet when you called me.

技巧3：

當句中謂語是除情態動詞、助動詞、系動詞was,were以外的動詞時，在該動詞之前加did not / didn't，動詞還原，構成否定句。例如：

The famous singer sang some Chinese songs. → The famous singer did not / didn't sing any Chinese songs.

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