есть ошибка нужно исправить в каждом предложении
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2) Jack's busy - he is writing emails at the moment

3) I don't know anybody in this town

4) Who are you talking to ?

5) I sometimes study in the library

6)I don't have anything to say to you

2 Jack is writing emails at the moment.

3 I know nobody in this town.(I don't know anybody in this town).

4 Who are you talking to?

5 I sometimes study in the library.

6 I have nothing to say to you.