【技巧1】當(dāng)句中含有情態(tài)動(dòng)詞或助動(dòng)詞could，would，should等時(shí)，可直接在其后面加not構(gòu)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(dāng)句中含有系動(dòng)詞was，were 時(shí)，可直接在其后加not構(gòu)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(dāng)句中謂語是除情態(tài)動(dòng)詞、助動(dòng)詞、系動(dòng)詞was,were以外的動(dòng)詞時(shí)，在該動(dòng)詞之前加did not / didn't，動(dòng)詞還原，構(gòu)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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