一變：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.→Icould 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 wasnot/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didnot/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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