If we decide to buy the cottage we'll have to do it up. 我们若决定购买这座别墅，就得重新进行装修。

Take it into one's head whtNWOGAzpto do sth. 突然决定搜趣网做某事，心血来潮

You will jolly well have to do sth. 你非得去做某事。

What made you decide to do a portal for gamers? 是什么让你决定为玩家做这样一个门户网站呢?

It is better to do sth late than never. 迟做总比不做好。

It is important and useful for 搜趣网sb. To do sth. 做某事对某人重要有用。

She decide to string along with the others as 搜趣网she have notwhtNWOGAzphing else to do. 她反正也无事可做，所以就跟着大家去了。