In life, we cannot answer "yes" to all questions. Sometimes we have to say "no".We cannot always make declarations. We may be in need of saying things in a negative sense.

                 Look at the following example.

He is a rich man. (Affirmative)

He is not a rich man(Negative)

                                                           Like opposite words, meanings also change here. We use the Auxiliary Verb "is" succeeded by "not " to make the sentence "negative".


                                           It will not always be possible if the Auxiliary Verb is hidden.

Example-:

 She writes letters.
                                           How can we form the negative of such a sentence? First, find out the Auxiliary Verb which is hidden in the verb, i.e does, then split the verb as does + write. Add "not" to the now clear Auxillary Verb. The "negative" of "affirmative" 
, we get:-

She writes letters. ->  She does not write letters.

Do it yourself 

1. I am a doctor.  ->  I am not a doctor.
2. She is an actress.  ->  She is not an actress.
3.Baby is crying.  -> Baby is not crying.
4.They ate mangoes.  ->  They did not eat mangoes.
5.I have sung a song.  -> I have not sung a song.
6.Madhu was a drunkard.  ->  Madhu was not a drunkard.
7.He paints the wall.  ->  He does not paint the wall.
8.Maria cried for sweets.  ->  Maria did not cry for sweets.
9.Mary had a little lamb.  ->  Mary had not a little lamb.
10. I ran to catch the bus.  -.  I did not run to catch the bus.
11.They are watching a movie.  ->  They are not watching a movie.
12.They enjoyed the movie.  -> They did not enjoy the movie.