初中英语知识点：初中英语易错题及解析
1. If it ________ tomorrow we'll go to the park.
A. will not rain B. doesn't rain C. is not raining D. didn't rain
答案：B.(选择A的同学要注意if引导的条件状语从句主句用将来时，从句用一般现在时。)
2. The radio says the snow ______ late in the day.
A. stops B. will stop C. has stopped D. stopped
答案：B.(选择A的同学要注意语境，late in the day表示 “晚些时候”，要用将来时。)
3. The nurse told the children the sun ______ in the east.
A. rises B. rose C. will rise D. has risen
答案：A.(选择B的同学要注意，虽然主句中用了told，但太阳从东方升起是真理性事实，应用一般现在时表示。)
4. -Are you sure you have to? It's been very late. -I don't know ______ I can do it if not now.
A. where B. why C. when D. how
答案：C.(选择D的同学要注意语境，根据语境知道这里强调的是必须现在做，否则就没有时间了。)
5. -Could you tell me _______ she is looking for? - Her cousin, Susan.
A. that B. whose C. whom D. which
答案：C.(选择其他3项的同学要注意语境，这里是指找Susan这个人。)
6. -When are the Shutes leaving for New York? -Pardon? -I asked ___________.
A. when are the Shutes leaving for New York C. when were the Shutes leaving for New York
B. when the Shutes are leaving for New York D. when the Shutes were leaving for New York
答案：D.(选择B的同学注意到了宾语从句的语序，但同时要注意时态要用相应的过去时。)
7. Would you please tell me ________ next，Mr. Wang?
A. what should we do B. we should do what C. what we should do D. should do what
答案：C.(选择A的同学要注意宾语从句的语序为陈述语序。)
8. Mr. King didn't know _______ yesterday evening.
A. when does his son come back B. when his son comes back C. when did his son come home D. when his son came home
答案：D.(选择C的同学要注意考虑宾语从句的陈述语序。)
9. Alice has gone to the classroom and she didn't say ____.
A. when did she come back B. when would she be back C. when she came back D. when she would be back
答案：D.(选择C的同学要注意语境，这里要用过去将来时。)
初中英语知识点：初中英语时态转换全解
英语的时态(tense)是一种动词形式，不同的时态用以表示不同的时间与方式。以下是几种常见时态的相互转换
一、 一般过去时与现在完成时的转换
在现在完成时中，延续性动词能与表示一段时间的状语连用，瞬间动词却不能。但是，可用别的表达方式：①瞬间动词用于“一段时间 + ago”的一般过去时的句型中;②瞬间动词可改成与之相对应的延续性动词及短语，与一段时间连用;③瞬间动词用于“It is + 一段时间 + since + 一般过去时”的句型中，表示“自从……以来有……时间”的意思，主句一般用it is来代替It has been;④瞬间动词用于“Some time has passed since + 一般过去时”的句型中。请看：
A. He joined the League two years ago.
B. He has been in the League for two years.
C. It is two years since he joined the League.
D. Two years has passed since he joined the League.
二、 一般现在时与现在进行时的转换
在一般现在时中，at加上名词表示“处于某种状态”，如at work(在工作), at school(上学、上课)等。此短语可与进行时态转换。请看：
Peter is at work, but Mike is at play.
Peter is working, but Mike is playing.
三、 现在进行时与一般将来时的转换
在现在进行时态中go, come, leave, start, arrive等动词常与表示将来的时间状语连用表示将要发生的动作。如：I am coming, Mum! 意为“我就来，妈妈!”请看：
The train is leaving soon.
The train will leave soon.
四、“be going to+动词原形”与“will(shall)+动词原形”结构的转换
“be going to+动词原形”、表示打算、计划要做的事;将来时“will(shall)+动词原形”结构在书面语中，当主语为第一人称时，常用助动词shall。在口语中，所有人称都可以用will。请看：
We are going to visit the Great Wall next Sunday
初中英语学习知识点：初中英语8大必会时态
一、 一般现在时：
1.概念：经常、反复发生的动作或行为及现在的某种状况。
2.时间状语： always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays,
3.基本结构：动词 原形 (如主语为第三人称单数，动词上要加(e)S)
4.否定形式：am/is/are+not;此时态的谓语动词若为行为动词，则在其前加don't,如主语为第三人称单数，则用doesn't，同时还原行为动词。
5.一般疑问句：把be动词放于句首;用助动词do提问，如主语为第三人称单数，则用does，同时，还原行为动词。
6.例句：. It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
二、 一般过去时：
1.概念：过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为。
2.时间状语：ago, yesterday, the day before yesterday, last week(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.
3.基本结构：be动词;行为动词
4.否定形式：was/were+not;在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：was或were放于句首;用助动词do的过去式did 提问，同时还原行为动词。
6.例句：She often came to help us in those days.
I didn't know you were so busy.
三、 现在进行时：
1.概念：表示现阶段或说话时正在进行的动作及行为。
2.时间状语：now, at this time, these days, etc.
3.基本结构：am/is/are+doing
4.否定形式：am/is/are+not+doing.
5.一般疑问句：把be动词放于句首。
6.例句： How are you feeling today?
He is doing well in his lessons.
四、 过去进行时：
1.概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作。
2.时间状语：at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。
3.基本结构：was/were+doing
4.否定形式：was/were + not + doing.
5.一般疑问句：把was或were放于句首。
6.例句：At that time she was working in a PLA unit.
When he came in, I was reading a newspaper.
五、 现在完成时：
1.概念：过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。
2.时间状语：recently, lately, since…for…,in the past few years, etc.
3.基本结构：have/has + done
4.否定形式：have/has + not +d one.
5.一般疑问句：have或has。
6.例句：I've written an article.
It has been raining these days.
六、 过去完成时：
1.概念：以过去某个时间为标准，在此以前发生的动作或行为，或在过去某动作之前完成的行为，即“过去的过去”。
2.时间状语：before, by the end of last year(term, month…),etc.
3.基本结构：had + done.
4.否定形式：had + not + done.
5.一般疑问句：had放于句首。
6.例句：As soon as we got to the station, the train had left.
By the end of last month. We had reviewed four books
七、 一般将来时：
1.概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事。
2.时间状语：tomorrow, next day(week, month, year…),soon, in a few minutes, by…,the day after tomorrow, etc.
3.基本结构：am/is/are/going to + do;will/shall + do.
4.否定形式：was/were + not; 在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：be放于句首;will/shall提到句首。
6.例句：They are going to have a competition with us in studies.
It is going to rain.
八、 过去将来时：
1.概念：立足于过去某一时刻，从过去看将来，常用于宾语从句中。
2.时间状语：the next day(morning, year…),the following month(week…),etc.
3.基本结构：was/were/going to + do;would/should + do.
4.否定形式：was/were/not + going to + do;would/should + not + do.
5.一般疑问句：was或were放于句首;would/should 提到句首。
6.例句：He said he would go to Beijing the next day.
I asked who was going there
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