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1)She (do)             a grammar exercise now.
2)She is a pupil.She often (do)     grammar exereises.
3)She (do)      the exereise an  hour ago.
4)My grandfather (work)     at the circus when he (be)    young.
5)Don"t ask him any questions now.He(work)      .

1)She is doing a grammar exercise now.2)She is a pupil.She often does grammar exereises.3)She did the exereise an  hour ago.4)My grandfather worked at the circus when he was young.5)Don"t ask him any questions now.He is working