i ve been是什么时态

Have 表示动作，如表示“吃（=eat）”“喝（=drink）”“拿（=take）”“收到（=receive）”“度过（=spend）”等时，在用法应注意以下几点：

(1) 可用于进行时态，但一般不用于被动语态。如：

误：Lunch is had by him.

正：He is having lunch. 他在吃中饭。

(2) 不与 got 连用。如：

误：I’d like to have got a look at it.

正：I’d like to have a look at it. 我想看看它。

(3) 一般不用缩略式。如：

误：We’d a good time at the party.

正：We had a good time at the party. 我们在晚会上玩得很高兴。

(4) 构成否定式和疑问式时，必须用助动词 do。如：

误：When had you breakfast?

正：When did you have breakfast? 你什么时候吃早餐?

表达将来时的几种结构:

be going to do

表示最近打算进行的事,具有一定的目的性和计划性.(这种安排既有可能是主语做出的,也有可能是别人安排 的')

We are going to have a meeting tomorrow.

表示即将要发生的事情，不可避免要发生的事情.(多用于表天气)

It's getting cloudy. It is going to rain.