If you succeed in doing something, you manage to do it.

如果你成功做某事，你就完成了它。

She is engaged in doing housework.

她忙着做家务。

This machine can assist you in doing heavy work.

这台机器可以辅助你完成繁重的工作。

Set a good example for children in doing housework.

在做家务方面为孩子树立一个好榜样。

I always assist my parents in doing the dishes after meals.

饭后我总是帮助父母洗碗。

Set an example in doing

在……树立榜样

Spend sth in doing sth

话费某物在做某事上

Assist sb. in doing sth.

帮助某人[做某事

Be punctual in doing sth.

在做……方面非常准时

Occupy oneself in doing sth.

使自己忙于做某事