将下列从句改写为非谓语动词形式.

将下列从句改写为非谓语动词形式.
The old man is so old that he can't work.
The old man is too old () ().
I don't know how I can get to do the TV factory.
I don't know () () () to the TV factory.
It took him two hours to do the work.
He () two hours () () ().
Mike hopes he can visit the Great Wall one day.
Mike hopes () () the Great Wall one day.
Please don't drink dirty water.
() () dirty water,please.