句型變換復(fù)習(xí)·肯定句變否定句

句型變換復(fù)習(xí)·肯定句變否定句

1. 謂語動詞是be、have(作“有”講)，或謂語動詞有助動詞、情態(tài)動詞時，在它們的后面加not。若句中有some時，需將some改為any。例如

I have some books on this subject.

→I have not any books on this subject.

He can speak English.

→He cannot speak English.

2. 當(dāng)謂語動詞是行為動詞，而句中又沒有情態(tài)動詞或助動詞時，需要在謂語動詞之前加do not, does not或did not 來構(gòu)成否定句。例如

I know something about it.

→ I don’t know anything about it.

3. 否定由think、believe、know等動詞引出的賓語從句時，應(yīng)將主句改為否定形式。例如

She knows why the train is late.

→She doesn’t know why the train is late.

4. 祈使句的否定形式是在謂語動詞前直接加do not。例如

Read in bed.

→Don’t read in bed.

5. 特殊句型

陳述句中含有had better，要將其變?yōu)榉穸ň鋾r，要把not加在better后。例如

You had better go with me.

→You had better not go with me.

陳述句中含有“both (all) of ＋名詞”作主語，要將其改為否定句時，要用neither來代替both，none代替all，并注意謂語動詞數(shù)的變化。例如

Both of them are Americans.

→Neither of them is American.