44.in/onthewall

inthewall指在墙体内

onthewall指在墙体表面

Thereisamaponthewall.

墙上有一张地图。

Thereisadoorinthewall.

墙上嵌着一道门。

45.on/in the bed

on the bed指物品在床上

in bed指人躺在床上

My bag is on the bed.

我的包在床上。

Lily is ill in bed.

莉莉躺在床上。

46.如此…...以至于...…

so/such...that...如此......以至于......(that引导结果状语从句)

so是副词,后接形容词或副词

such是形容词,后接名词

Tom is such a clever boy that he cananswer the question.=Tom is so clever a boy that he can answer the question.

汤姆如此聪明,以至于他能够回答这个问题。

The box is so heavy that I can’t carry it.

这个箱子如此重,以至于我搬不动它。

注意:在名词前有many/much/few/little这些词修饰时,要用so…that...。

47.当......的时候

when+延续性/短暂性动词

while+延续性动词(多用进行时)

When I was watching TV,he came in.

=When he came in,I was watching TV.

While I was in Shanghai,I visited him.

48.at the age of和when引导的时间状语可以互换

I began to play football when I was five years old.

=I began to play football at the age of five.

我五岁时开始踢足球。

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