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Ответ:

1.John has written his name

2.I have drawn a picture

3.Tom has switched on the light

4.The cat has drunk its milk

5.The tree has fallen across the road

6.John has given his bicycle to his brother

7.You have made a mistake

8.We have eaten our dinner

9.The train has just gone

10.I have just told the answer

11.George hasn't been in Australia

12.John and Richard have just gone away