一、定义
将来时表示将来某一时刻的动作或状态，或将来某一段时间内经常的动作或状态。常常和表示将来的时间状语连用。
二、结构
（一）基本结构
1、will / shall + 动词原形（否定句在will/shall后加not）
2、be going to+动词原形 be going to 相当于一个助动词(其中be有人称和数的变化),与它后

3.用于"I expect, I'm sure, I think, I wonder等的宾语从句"中。
Don't worry about the exam. I'm sure you'll pass.
不要担心这次考试，我确信你会通过的。
2、用于祈使句和陈述句中。
Work hard and you will succeed.
如果你努力，就会成功的。
3、与表示时间或条件的状语从句连用。
I'll let you know as soon as he arrives.
他一到我就通知你。
will与be going to 的分别 be going to与will两者都可表示将要发生的事、将要去做某事，但它们有如下几点区别：
1.be going to 表示将要发生的事情，will 表示的时间则较远一些，如：
He is going to write a letter tonight. He will write a book one day.
2.be going to 表示根据主观判断将来肯定发生的事情，will表示客观上将来势必发生的事情。 如：He is seriously ill. He is going to die. He will be twenty years old.
3.be going to 含有“计划，准备”的意思，而 will 则没有这个意思，如：
She is going to lend us her book. He will be here in half an hour.
4.在有条件从句的主句中，一般不用 be going to, 而多用will, 如：
If any beasts comes at you, I'll stay with you and help you.
5.be going to和will在含义和用法上稍有不同。be going to往往表示事先经过考虑的打算；will多表示意愿，决心。两者有时不能互换。如：
She is studying hard and is going to try for the exams.
她正努力学习并尝试参加考试。（is going to不能用will替换）

（1））They_________ (write) letters the whole morning. They
didn't have a rest.
（2）Look! The children_________ (play) in the park.
（3）Yesterday I_________ (go) to_________ (see) a film. On my way to the cinema, I_________ (meet) your mother there. We_________ (talk) a lot.We_________ (be) very happy.
（4）We_________ (have) a good time in the Summer Palace last
Sunday.
（5）He _________ (break) his left leg in the accident yesterday. His friends _______(take) him to hospital at once.
（6）Stop _________ (talk), class begins now." The teacher says. All the students stop ________(listen) to the teacher.
（7）Don't forget ________ (close) the window when you leave the room.
（8） Why not__________ (go) to the park with me tomorrow?
（9）My mother asked me ________ (help) her _________ (clean)
the room.
（10）Miss Green_________ (teach)in that school since about ten years ago.