(十)当肯定句中含有still时，改为否定句，须将still改为not．．． any longer或not．．．any more。如：
The scientist still lives there．→The scientist doesn't live there any longer．
She still cried．→She didn't cry any more．
(十一)当肯定句中含有often时，改为否定句，可将often改为seldom。如：
We often play basketball．→We seldom play basketball．
(十二)当肯定句中含有a few，a little时，改为否定句，可将a few，a little改为few，little即可。如：
I had a little milk this morning．
→I had little milk this morning．
There are a few books on the desk．
→There are few books on the desk．
(十三)当肯定句中含有连接两个或两个以上的并列成分的连词and时，改为否定句，一般要将and改为or。如：
He can sing and dance．→He can't sing or dance．
(十四)当肯定句中含有并列连词both．．．and．．．或not only．．．butalso．．．结构时，改为否定句，要用neither．．．nor．．．或not．．．either．．．or．．．结构来表示否定。如：
He studied both English and Russian．
→He studied neither English nor Russian．
→He didn't study either English or Russian．
The boy is not only clever but also diligent．
→The boy is neither clever nor diligent．
→The boy isn't either clever or diligent．
(十五)当肯定句中含有both，all（every），everybody，everything等表示总括意义的代词、形容词或副词时，改为否定句，要把上述词分别改为相应的neither，none，nobody，nothing等。否则，就可能成为部分否定句。如：
Both of us can speak English．
→Neither of us can speak English．
All of the students are going to the cinema．
→None of the students is going to the cinema．
Everybody has seen the film．
→Nobody has seen the film．
(十六)当肯定句是祈使句，改为否定句时，一般在动词原形前加don't。但以let开头的祈使句，变否定句时，可直接在省略to的动词不定式前加not或在let前加don't。如：
Read the book．→Don't read the book．
Let Tom come here．
→Let Tom not come here．
→Don't let Tom come here．
(十七)在I think ／believe ／suppose ／expect等引起的宾语从句中对从句含义加以否定时，在形式上要否定主句谓语动词。如：
I think the book is very interesting．
→I don't think the book is very interesting．
I believe that she'll be back soon．
→I don't believe that she'll be back soon．
