状语从句。主谓一致。几种时态转换

中考英语语法：状语从句时态类型

1、时态说明

1）在时间和条件状语从句中，通常要用一般现在时表示将来意义，不能直接使用将来时态：

I won’t go if it rains tomorrow. 要是明天下雨，我就不去。(不能用will rain)

2）有时也可见到if you will 这样的说法，但那不是将来时态，而是表示意愿或委婉的请求(此时的will是情态动词)：

If you will wait a moment, I’ll fetch the money. 请等一下，我就去拿钱。

2、常见类型

状语从句即指在主从复合句中用作状语的从句。状语从句根据其用途可分为时间状语从句、地点状语从句、原因状语从句、结果状语从句、目的状语从句、条件状语从句、方式状语从句等：

He was angry because I was late. 他很生气因为我迟到了。(原因状语从句)

He was so angry that he couldn’t speak. 他气得话都说不出来。(结果状语从句)

Although he is poor, he’s happy. 虽然穷，但他仍很快乐。(让步状语从句)

Put it where you can reach it. 把它放在你可以拿到的地方。(地点状语从句)

Speak clearly so that they may understand you. 讲清楚些，以便他们能理解你。(目的状从)

中考英语语法复习：主谓语法一致的原则

谓语受主语支配，须和主语在人称和数上保持一致，这叫做主谓一致。主谓一致一般遵循三条原则：语法一致原则，意义一致原则和就近一致原则。

1. 语法一致的原则

（1）以单数名词或代词，动词不定式短语作主语时，谓语动词要用单数;主语为复数时，谓语用复数，例如：

He goes to school early every morning.

The children are playing outside.

To work hard is necessary for a student.

（2）由and或both……and连接的并列成分作主语时，谓语动词用复数。例如：Both he and I are right.

Mr Black and Mrs Black have a son called Tom.

但并列主语如果指的是同一人，同一事物或同一概念，谓语动词用单数。例如：

His teacher and friend is a beautiful girl.

The poet and writer has come.

（3）由and连接的并列单数主语之前如果分别由each, every修饰时，其谓语动词要用单数形式。例如：

In our country every boy and every girl has the right to receive education.

Each man and each woman is asked to help.

（4）主语是单数时，尽管后面跟有but ,except, besides, with 等介词短语，谓语动词仍用单数。例如：

The teacher with his students is going to visit the museum.

Nobody but two boys was late for class.

Bread and butter is a daily food in the west.

（5）一些只有复数形式的名词，如people, police, cattle, clothes等作主语时，谓语动词要用复数。例如：

A lot of people are dancing outside.

The police are looking for lost boy.

（6）由each, some, any, no, every 构成的复合代词作主语时，谓语动词都用单数。例如：Is everybody ready?

Somebody is using the phone.

（7）有两部分构成的物体的名词，如glasses, shoes, trousers, chopsticks, scissors 等作主语时，谓语动词用复数。例如：

Where are my shoes? I can’t find them.

Your trousers are dirty. You’d better change them.

如果这类名词前用了a pair of等，则往往用作单数，谓语动词的单复数形式往往取决于pair的单复数形式。例如：

Here are some new pairs of shoes.

My new pair of socks is on the bed.

初中英语语法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.

We shall visit the Great Wall next Sunday.