be doing和doing的区别

e doing 可以用于现在进行时,过去进行时,有时还可以表示将来
be going to do只能表示将来,或是未来的打算

e doing 不是表示将来,而是表示一种进行的状态,可以用于过去时态、现在时态和将来时态
也即 过去进行时,现在进行时,将来进行时

will +动词原形构成的将来时
表示主观意愿,未经事先精心计划或打算.
be doing 表现在进行时用来表示一个在最近按计划或打算要进行的动作,用进行时表将来的常用动词：
go,come,leave,start,arrive,stay,give,return,sleep ,stay,play,take,get,see off,travel,fly,drive,walk,reach,meet,do,…

e doing 通常指正在做什么,表示正在发生,如：1,I am playing football with my friends; 2,Tom is laughing loudly when the teach comes into the classroom.也可以用来表示马上就要发生的事,（很少用）如：Let me go,my flight is taking off.让我走,飞机马上就要起飞了.be to do表示要做什么,应该做什么.（但都还没有动作） 如：It is to be paid.这会遭到报应的.(但还没有报应)

I am writing to you at home .Having not seen you for such a long time ,I miss you so much and now I'm thinking of the stories between us,that are very valuable for me ...The memories flooding me ,i'll never forget that it's so kind of you that whenever i was in trouble ,you always encouraged me to cheer up.With time going ,we are getting along well with eachother .and i hope that we are the best friends all the time .what's more,please don't hesitate to turn to me for help whenever you get trapped ,i'll do my best to help you.
I am looking forward to hearing from you

will do.一般将来时，表将来某时会做某事%D%Awill be doing 将来进行时，表将来某时正在做某事%D%Awill have done将来完成时，表将来某时已经做完某事

前者是进行时,表示某时正在进行的动作.将来进行时：I will be watching the film this time tomorrow.现在进行时：I am having breakfast now.过去进行时：I was reading when he came into my room yesterday.更多的时态你去翻语法书.后者是动名词,动名词短语可以用作需要名词或名词从句的地方.Going shopping is the favorite activity of most girls.

I am watching TV.
she is doing her homework.
he is playing the violin.
my dog is playing with a ball.
we are singing and dancing happily.
they are having an english lesson.
my mother is cooking food.
liu tao is picking oranges.
su hai and su yang are taking photos.
Mrs Green is collecting eggs.

1.will+动词原形,.
就是表示一般将来时..这个比较常用
2.be going to do
将会...
一般用于将来时态
例句与用法:
1.I am assuming that the present situation is going to continue.
我认为目前的情况将会继续下去.
2.It's going to cost 200 or as near as dammit.
这要花200英镑上下.
3.How did you find out that Burns was going to be promoted?
你是怎么知道伯恩斯将会得到提升的?
4.You must be out of your mind if you think I'm going to lend you 50!
你以为我会借给你50英镑,你准是疯了!
5.I'm just going to check inthese books at the library.
我要去图书馆还这些书.
6.They are going to move to a new house next week.
下星期他们将迁入新居.
7.It looks as if it is going to rain.
看来要下雨了.
8.Are you going to America by boat or by plane?
你到美国是坐船还是坐飞机?
3.be to do
表示安排、计划、决定、命令或注定要发生的事.
一般用于被动语态,to be done
也可以用于主动语态...都是表示将来时态
比如：
Greater efforts to increase agricultural production must be made if food shortage is to be avoided.
为避免食物短缺,我们需要更加努力来提高农业生产.
The bridge is to be built next year.
大桥将在明年修建.
以下是主动语态的例句：
He is to die.
他就要死了.
To live is to work.
活着就要工作.
比较：
I am to be an engineer.
我就快要成为工程师了..（这个时间上快一点,而且比较有把握,比如已经考到证了..）
如果是：
I am going to be an engineer.
意思就变成了：
我将成为工程师...（这个只是主观愿望.没有多少把握）
4.be about to do
表示即将,马上要做的事,.,
这个比其他的几个都要紧迫..
比如：
I am about to leave.
我马上就要离开了.（刻不容缓,就是这一两分钟的事）
比较：
I am going to leave.
我将要离开.（还指不定是什么时候）
5.be doing
主要用于现在进行时态,有时可以用来表达将来时
例句与用法:
How are you doing with your new boss?
你跟你的新上司处得如何?
We are doing a pilot study to see if the new product will sell well.
我们正在为这种新产品做试销调查,看它的销路好不好.
According to these figures,our company is doing well.
从这些数字来看,我们的公司经营得不错.

e doing可以换成will,但在你给的例句中是不可以的,这里是表示陈述不可改变的事实,只能用is leaving.

e +doing 不一定是现在进行时态啊,有可能是动名词做表语,例如
Her job is raising pigs
His job is washing dishes
His hobboy is collecting stamps
以上都是动名词做表语,说明主语表示具体内容

e doing 是正在做或想做
be going to do 要去做
区别在于be doing也表示正在做,不好区分是不是正在做或想去做,只能在句子里理解.
be going to do更肯定.be going to do更肯定.be going to do 表示主动,将要做某事
be doing,表示某人或物正在做某事
第一个应该是will be doing 吧...
will be doing 表示人的主观意愿.be going to doing 是人无法控制的动作

It's seven o'clock in the evening.My grandmother is watching TV.My father is talking to my uncle.My mother is doing some reading.My sister is playing computer games.I'm playing chess with my friends.We are very busy.

1 将来时,选A/D 它们区别是前者没有计划,后者有计划.第二个人是被第一个人提醒后才去关灯的,所以没有计划选A
2 leave 可以用一般现在时表示将来,表示时刻表上计划
所以选择A

将要去做某事情
正在做某事情

也可以的,可以表示就要做某事了
如：be coming 就来,be going就走,be leaving 就离开.

e doing只能说是进行时态的谓语动词形式.am/is/are +doing才是现在进行时的谓语动词形式.
只有am/is/are doing出现才是现在进行时,所以说am/is/are doing构成现在进行时

e doing 在一般情况下都是现在进行时!
当你刚才说到的表示位置移动的动词用了be doing这个就成了一般将来时!
也就是说如:go come fly 等词用be doing的时候,就表明是一般将来时咯