Turn the following sentences into the negative:
1.That man has left the house;
2.The little children have crossed the road;
3.You have known the answer;
4.I have had breakfast;
5.You have enjoyed the play;
6.The woman has read the letter;
7.You have been ill;
8.I have spent several days here;
9.We have been very busy;
10.The students have entered the room;
11.You have gone to the cinema;
12.I have travelled by train;
13.The little boy has thought of Robin Hood;
14.The pupils have drawn many flowers;
15.You have ridden the new bicycle.
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