to do / to be doing / to have done / to have been doing/doing/having done/done

能分别造几个句子区分一下吗。谢谢

1.Find something else to do!
找其它事情去做吧！
2.Eddie, isn't there something you're supposed to be doing now?
艾迪，你现在是不是有件事必须要马上去做的？
3.He felt ashamed to have done such a thing.
他很惭愧做了这样的事。
4.Have you been sitting here calmly and doing nothing to help them?
你一直闲坐着没帮他们做点什么事吗？
5.What were you doing?
你在这做什么？
6. Having worked for a whole day,the secretary looked harassed.那秘书工作了整整一天，看上去十分疲倦。
7.As soon as the cake is done, remove it from the oven.
蛋糕一烤好就从炉子里取出来

没看懂什么意思？

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