【技巧1】當(dāng)句中含有情態(tài)動詞或助動詞could，would，should等時，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)句中含有系動詞was，were 時，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(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.

　　二變：陳述句變?yōu)橐话阋蓡柧?/strong>