2.The meeting begins
(begin)
at half past two tomorrow afternoon .
5. 在时间、条件状语从句中，用一般现在 时表示将要发生的动作。
1.When he
(be)18 years old , he
will join the army .
2. Take an umbrella in case it _____ (rain) tomorrow .
1.China has changed a great deal in the past
20 years.
2. It has rained every day so far this month.
3. It‘s the first time I have been in this town.
3.在时间 / 条件状语从句中，可以用 现在完成时表示将来某时已经完成的
—Good morning，I wonder if you can help.I ________ my
coat.
—Oh，where did you lose it，madam?
A．have lost
B．lost
C．had lost
D．lose
2.现在完成时所表示的动作开始于过去，持续 到现在，也许还会持续下去。常和for和since这 种表示一段时间的状语，或so far、up to now ，recently/lately、段时间+before，never， already，yet，during/over /in the last/past +时 间等状语连用。
注意！
表示感觉、情感、心理状态的动词如: smell , taste, sound ,look , feel ,love，like，hate，hope
，wish，want，prefer，know，understand， remember，agree，believe，recognize，guess ，suppose（假设；认为），mean，hear，see， seem，find，mind，have(有)等通常不用进行时。
She has been playing tennis since she was eight.
3. 现在完成时强调动作行为的结果、影响，而现在完成进行时 只强调动作行为本身，如:
Tom's hands are very dirty. He has been repairing the car. The car is going again now. Tom has repaired it.
，start，arrive, stay等。 He is leaving for Spain.他就要动身去西班牙了。
1. I am leaving (leave) for Bejing tomorrow .
2. Sally is staying(stay) in her aunt’s home when
2.含义：1) 表示一个在过去开始而在最近刚刚结束的行动。 Ann is very tired. She has been working hard.
Why are your clothes so dirty? What have you been doing? 2) 表示一个从过去开始但仍在进行的行动。 It has been raining for two hours. (现在还在下) Jack has been feeling very well recently. 3) 表示一个从过去开始延续到现在，可以包括现在在 内的一个阶段内，重复发生的行动。
to visit us，but you didn’t .
2.She had thought (think) of adopting an orphan ,
but was prevented from doing so .
不能说：She has come here for two hours .
只能说 ：She has been here for two hours .
或者说 ： She came here two hours ago .
注意２ since 引导的从句用一般过去时，主句要用现
在完成时。如：
2. It’s a long time since he was in the army . 他不在部队已经很久了。
3.It’s four years since my father worked in that factory . 我爸爸不在那工厂工作有四年了。
4. It’s four years since my father started work in that
We have been (be) friends ever since
we met (meet ) at school .
since 从句中的短暂性动词可翻译为“自从做某事 以来已经多久了”，但延续性动词则应译为“不做 某事多久了”
１.It’s a long time since he joined the army . 他参军已经很久了。（他还在部队）
1. By the end of last week we had studiedfive books.
2.I had learnt 5,000 words before I entered the university.
3.When he arrived at the station, the train had already left.
2. In 2000 they were studying (study) in a university .
二、有些表示“移动”的动词：go , come , leave , arrive , set out , take off 等的过去进行时常表示过去 将来时。
1. John told us they were leaving (leave) for
she is in Britain .
三、当always，constantly与进行时态连用时，表示不 耐烦、抱怨，赞美等感情色彩。
1.She is always asking(ask) such silly
questions .
2. They are always helping(help) others.
2. Is the baby sleeping (sleep) next door?
3. At present the environment is being polluted (pollute)
seriously .
三.现在进行时表示一般将来时：表示即将发生的动作或按计划即 将发生的动作。 常见的词有：come，leave，reach，return，go
不能说：
1.We are wanting to take part in the lecture .
2. The food is tasting nice .
3.Kate is knowing the answers.
现在完成时
构成：has/have + v-ed
含义：
成的影响和结果；
2.He said he would not go if it rained.
过去进行时was / were doing
一、表示过去某一时刻或某一阶段正在进行的动作。
1. What was she doing(do) this time yesterday ? She was practising (practise) gym.
factory . 我爸爸在那家工厂工作有四年了。
注意３
It/This is the first / second time that I have done…… 这个句型常用现在完成时。 It‘s the first time I have been in this town.
现在完成进行时
1.构成：have/has been＋doing
一般过去时
did ( didn’t do) 或 were ( weren’t) / was ( wasn’t)
记住常用的动词过去式和过去分词
含义：一般过去时表示过去某个时间发生的动作 或状态，常和表示过去的时间连用，yesterday, last night, in 1990, two days ago等。也表示过 去经常或反复发生的动作，常和often, always等
London the next week and that they were
coming(come) to say goodbye that evening .
过去完成时 had done
一、表示过去某一时刻或某一事件之前已经发生或完成的 动作、状态，即“过去的过去”，可译成“在那之前已经 做了某事”。因此，使用它就必须有一个过去某一时间。。 常用 by , before , when 等引起的时间状语。
4.一般现在时表示将来，用于谈论时间表、日程表、 节目单等安排好的活动。句中常有时间状语，但仅用 于少数几个表示“移动”的动词：come , go , arrive
, begin , leave , return , start , 等。
1.The plane leaves
(leave) for
Paris at eight this evening .
Scientists told us the earth moves around the sun .
2.标志词：always ，often，usually，sometimes， every day/week/month/year, once a week