①will/ shall + 动原，表示将来的动作或状态。
如: He will be a billionaire when he grows up.
②be going to + 动原，表示即将发生或近期计划的事情。
如:. Mr. Liu is going to spend his holiday in Hawaii.
③be about to + 动原，表示即将发生的动作
该结构不与将来时间状语连用。
如:
Ted is about to eat outside tomorrow evening.
My uncle was about to leave when I arrived at home.
④be to + 动原，表示按计划要发生的动作或用于征求对方意见。
如: Are we to leave for London this afternoon?
⑤一般现在时表将来在when， while， before， after， once， as long as， unless， as soon as等引导的时间状语从句中，通常用一般现在时表示将来时态。
如:The liitle boy is going to visit the Great Wall as soon as he gets to Beijing.
⑥现在进行时表将来强调近期、按计划或安排要发生的动作，谓语通常是瞬时性动词（come， go， arrive， start， begin， leave等）。
如: They are coming home in half an hour.
We are starting this project this year.
