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1.系表结构：Linking verb. + adj. 常见的连系动词如下:

1)be 动词：He is helpful. They are tired.

2) 表 “…起来”：look看起来; sound听起来; taste尝起来;feel摸起来等等.如:

3)表状态变化的连系动词有：get 变得; turn 转变; go变; become变成 等等. 如:

In summer, the days get longer, the weather gets warmer.

In fall, the leaves turn yellow. The mother went mad.

He became angry.

2.because 引导的原因状语从句: because 用来回答why提问的问句,表示的原因语气很强,一般用在主句后面,强调因果关系.

Mr. Wang looks tired because he worked late last night and didn’t get enough sleep.

Kangkang is disappointed because his best friend is not able to come.

----Why do they feel proud?

----Because a player from their country won a medal.

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