Someone must be at the back of this. 这事一定有人在背后捣鬼。

2. in the back of 在……后部。如：

He sat in [at] the back of the car. 他坐在小汽车后部。

注：在美国英语中有时可只用 (in) back of 来表示以上意思。如：

My home lies (in) back of the school. 我家就在学校后面。

3. on one’s back 在背上，仰着身子。如：

The little boy had a big schoolbag on his back. 这个小男孩背上背着一个大书包。

They lay on their backs and gazed at the sky. 他们仰着身子躺着，眼睛望着天空。

bad

1. be bad at 不善于。如：

I’m bad at maths. 我数学学得很差。

He is bad at playing tennis. 他网球打得不好。

2. be bad for 对……不好。如：

Too much salt can be bad for you. 吃太多的盐对你不好。

Smoking is bad for you (your health). 抽烟对你(你的身体)有害。

3. go from bad to worse 变得越来越糟，每况愈下。如：

His business is going from bad to worse. 他的生意每况愈下。

We’re hoping for an improvement but things have gone from bad to worse. 我们希望有所改善，但情况却变得越来越糟。

base

1. base sth on [upon] sth 一事物以另一事物为基础(前提等)。如：

He always bases his opinions on facts. 他的意见一向以事实为依据。

You should base your conclusion upon careful research. 你下的结论应该以仔细的研究为基础。

注：有时用于被动语态。如：

This story is based on facts. 这个故事是有事实依据的。

bear

1. can’t bear doing [to do] sth 不能忍受做某事。如：

I can’t bear living [to live] alone. 一个人独居我受不了。

He can’t bear travelling [to travel] by sea. 他坐不了海船。

注：有时其后不定式或动名词可以带有逻辑主语。如：

I can’t bear him to marry her. 我不能容忍他与她结婚。

He can’t bear people smoking while he’s eating. 他在吃饭时不能容忍别人抽烟。

2. be born 出生。如：

I was born in 1962. 我生于1962年。

He was born of a wealthy family. 他出身富门。

because

1. because of 因为。如：

He lost his job because of his age. 由于年龄关系他失去了他的工作。

He left the company because of what the boss said at the meeting. 他离开了这家公司，是因为老板在会上讲的话。

注：because of 之后可接 what 从句，但不能接 that从句或没有引导词的句子。如：

他因病未来。

误：He didn’t come because of he was ill.

误：He didn’t come because of that he was ill.

正：He didn’t come because he was ill.

正：He didn’t come because of his illness.

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