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3. Tom has blown out the light. +
Tom hasnt blown out the light. -
Has Tom blown out the light
4. The cat has drunk its milk. +
The cat hasnt drunk its milk. -
Has the cat drunk its milk
5.The tree has fallen across the road. +
The tree hasnt fallen across the road. -
Has the tree fallen across the road
6. John has given his bicycle to his brother. +
John hasnt given his bicycle to his brother. -
Has John given his bicycle to his brother
7.You have made a mistake.+
You havent made a mistake. -
Have you made a mistake
8. We have eaten our dinner. +
We havent eaten our dinner. -
Have we eaten our dinner
9. The train has just gone. +
The train hasnt gone yet. -
Has the train just gone 
10. I have just told the answer. +
I havent told the answer yet. -
Have I just told the answer