Rewrite these sentences (i) in the negative form and (ii) in the interrogative form. Read your answers aloud.
1.   I was having my lunch at a restaurant.
2.  Saheli was reading the newspaper at eight o clock.
3.  She waited for her friend at the bus stop.
4.  They were laughing at his silly jokes.
5.  He was walking past the shop when the bomb burst.

Answers are given below:-
1.i) In negative : I was not having a lunch at a restaurant.
   ii) In interrogative : Was I having a lunch at a restaurant ?

2.i) In negative : Saheli was not reading a newspaper at eight o' clock.
   ii) In interrogative : Was Saheli reading a newspaper at eight o' clock ?

3.i) In negative : She did not wait for her friend at the bus stop.
  ii)In interrogative : Did she wait for her friend at the bus stop ?

4.i)In negative : They were not laughing at his silly jokes.
  ii)In interrogative : Were they laughing at his silly jokes ?

5.i) In negative : He was not walking  past the shop when the bomb burst.
  ii) In interrogative : Was he walking  past the shop when the bomb burst?

Please check the answers thoroughly and explain the wrong obviously.