decide只是个动词，这个动作可用于任何时态。

decide vt.＆vi.决定，决心；名词形式为decision。其基本用法如下：

1)跟名词或代词：

①It is the people who decide the fate of mankind. 决定人类命运的是人民。

②The question will be decided by themselves. 问题将由他们自己决定。

2)跟不定式：

①He decided to give a one-man show.他决定唱一段独角戏。

②We haven't decided when to start.我们还没决定何时动身。

3)跟从句：

①Let's first decide where we should go.

(=Let's first decide where to go.)

我们先决定一下到什么地方去。

②It is not decided whether we will go there. 还没有决定我们是不是去那儿。

4)跟介词短语(跟on或upon，表示“就某事做出决定”)：

①Don't decide on important matters too quickly.

重要的事情不要匆忙做出决定。