Be good at doing sth

干某事───Do sth;擅长───be good at

It's scary to do STH.───做某事是很可怕的。

It's a good idea (for sb) to do STH.───做某事(对某人而言)是一个好主意。

time to do STH.───某人做某事的时间到了。

How much does it cost to do sth?───去做某件事情要花多少钱？

The child is really happy to see his mother come up. see sb. do sth.───看到他妈妈正走过来，这个小孩真的很高兴。

she said: "do sth on Thanksgiving day. . . " i nodded and said : "many thanks. . . "───“在感恩节做些什么吧。”我点点头说：“十分感谢您。”

Lay oneself out to do sth.

Be in duty bound to do sth.

to grant sb. permission to do sth.

To do sth. oneself is often easier than getting sb. else to do it.

Try one's best to do sth.