拓展以must开头的一般疑问句,肯定回答用must,否定回答用needn't或don't have to,意为“不必”。
三 连词:because
because是连词,意为“因为”,后面跟句子。because主要用于以下两种情况:
1.回答由why引导的特殊疑问句
— Why do you like studying in the library?
你为什么喜欢在图书馆里学习?
-Because it is air-conditioned.
因为它装有空调。
2.引导原因状语从句,通常放在主句之后
I like English because it's interesting and useful.
我喜欢英语,因为它既有趣又有用。
拓展
拓展①because of意为“因为,由于”,是介词短语、其后可接名词、代词或动名词。
Because of the heavy rain,we have to stay at
home.由于大雨,我们不得不待在家里。
②because与so不能同时用于一个句子,只能用其中的一个。
My sister is in bed because she is ill.
我姐姐躺在床上,因为她病了。
= My sister is ill so she is in bed.
我姐姐病了,所以她躺在床上。
句型
1.主语+must+动词原形(+其他).某人必须……
All students must wear red scarves.
全体学生必须戴红领巾。
2.because引导原因状语从句
Not many students like playing in the playground because it is very hot.
没有很多学生喜欢在操场上玩耍,因为天气很热。
3.like doing sth.喜欢做某事
Many students like studying in the library.
很多学生喜欢在图书馆里学习。
4. keep + adj.保持……
It helps them keep warm.
这有助于他们保持身体暖和。
作文
[经典范文)
In the school garden
Not many flowers grow in the garden.There are
not many leaves on the trees.
In the playground
Many students like making snowmen because it
is great fun.
In the library
Many students like studying in the library because
it is warm here.
In the canteen
Not many students like having soft drinks or icecream because it is very cold.