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一、afraid adj.害怕的
1.be afraid of sb/sth/doing sth/to do sth表示“害怕某人、某事物或做某事”。
There is nothing to be afraid of.没有什么可怕的。
She is afraid of going /to go out alone at night.她害怕晚上独自出去。
2.be afraid of doing sth表示“担忧或忧虑（某事物可能产生的后果）”。
I didn’t tell her because I was afraid of worrying her.我没有告诉她是怕她担心。
3.be afraid+that从句表示“担心，恐怕”。有时用于句首表达一种委婉的语气。
I am afraid that I can’t help you with your lessons tomorrow.
恐怕我明天不能帮你复习功课了。
4.表示同意，意为“恐怕是这样”，表示不同意，意思是“恐怕不……”。
—Will there be rain tomorrow? 明天有雨吗？
—I’m afraid so.恐怕有。
—Do you have a pen? 你有钢笔吗？
—I am afraid not.对不起， 没有。
二、trouble n.困难；苦恼；忧虑 v.麻烦
1.n.困难；苦恼；忧虑 v.麻烦
Don’t trouble trouble until trouble troubles you.不要自找麻烦，除非麻烦来找你。
2.have trouble(in) doing sth表示“做某事有困难”。
They had trouble in finding the lost suitcase.他们费了很大的力气才找到那个丢失的衣箱。
3.get into trouble意为“惹上麻烦”。
The boy always gets into trouble at school.那个男孩总是在学校里惹麻烦。
4.be in trouble意为“处于困境”。
We shouldn’t laugh at people when they are in trouble.
当人们处于困境时我们不应当嘲笑他们。
三、mistake n.错误v.弄错
1.n.错误
There are a lot of spelling mistakes in the letter.这封信中有许多拼写错误。
2.by mistake意为“错误地（因粗心、遗忘等所致）”。
Sorry.I took your umbrella by mistake.对不起我错拿了你的雨伞。
3.make a mistake意为“犯错误”；make a mistake in...意为“在……出错”。
He made so many mistakes in grammar that the teacher got angry with him.他犯了那么多语法错误，以至于老师生他的气了。
4.mistake...for意为“把……错当成”。
Sorry.I mistook you for one of my friends.对不起，我把你错当成我的一位朋友了。
强化训练
根据汉语提示，完成下列句子。
1.She _________(怕唱歌)in front of a lot of people.
2.They had trouble_________（明白）the article.
3.Don’t_________(犯同样的错误),or I will be mad at you.
4.What should we do if a child has taken medicine_________(错误地) ?
5.I_________(错把她当成她的妹妹)yesterday.
6.He_________(害怕) the dark.
7._________(恐怕)that you have to walk all the way.
8.You_________（会惹上麻烦）if you keep telling a lie.
9.I’m sorry_________(给你添麻烦了).
10.The more careful you are，_________(更少的错误)you will make.
Keys:
used to的用法：
I.1.be 2.doing 3.are used 4.to cook 5.Did...use 6.didn’t use 7.staying 8.to work
II.1.There used to be 2.is used to chatting with/talking with 3.will soon get used to 4.used to sleep with the light on 5.Did,use to play
1.be afraid of sb/sth/doing sth/to do sth表示“害怕某人、某事物或做某事”。
There is nothing to be afraid of.没有什么可怕的。
She is afraid of going /to go out alone at night.她害怕晚上独自出去。
2.be afraid of doing sth表示“担忧或忧虑（某事物可能产生的后果）”。
I didn’t tell her because I was afraid of worrying her.我没有告诉她是怕她担心。
3.be afraid+that从句表示“担心，恐怕”。有时用于句首表达一种委婉的语气。
I am afraid that I can’t help you with your lessons tomorrow.
恐怕我明天不能帮你复习功课了。
4.表示同意，意为“恐怕是这样”，表示不同意，意思是“恐怕不……”。
—Will there be rain tomorrow? 明天有雨吗？
—I’m afraid so.恐怕有。
—Do you have a pen? 你有钢笔吗？
—I am afraid not.对不起， 没有。
二、trouble n.困难；苦恼；忧虑 v.麻烦
1.n.困难；苦恼；忧虑 v.麻烦
Don’t trouble trouble until trouble troubles you.不要自找麻烦，除非麻烦来找你。
2.have trouble(in) doing sth表示“做某事有困难”。
They had trouble in finding the lost suitcase.他们费了很大的力气才找到那个丢失的衣箱。
3.get into trouble意为“惹上麻烦”。
The boy always gets into trouble at school.那个男孩总是在学校里惹麻烦。
4.be in trouble意为“处于困境”。
We shouldn’t laugh at people when they are in trouble.
当人们处于困境时我们不应当嘲笑他们。
三、mistake n.错误v.弄错
1.n.错误
There are a lot of spelling mistakes in the letter.这封信中有许多拼写错误。
2.by mistake意为“错误地（因粗心、遗忘等所致）”。
Sorry.I took your umbrella by mistake.对不起我错拿了你的雨伞。
3.make a mistake意为“犯错误”；make a mistake in...意为“在……出错”。
He made so many mistakes in grammar that the teacher got angry with him.他犯了那么多语法错误，以至于老师生他的气了。
4.mistake...for意为“把……错当成”。
Sorry.I mistook you for one of my friends.对不起，我把你错当成我的一位朋友了。
强化训练
根据汉语提示，完成下列句子。
1.She _________(怕唱歌)in front of a lot of people.
2.They had trouble_________（明白）the article.
3.Don’t_________(犯同样的错误),or I will be mad at you.
4.What should we do if a child has taken medicine_________(错误地) ?
5.I_________(错把她当成她的妹妹)yesterday.
6.He_________(害怕) the dark.
7._________(恐怕)that you have to walk all the way.
8.You_________（会惹上麻烦）if you keep telling a lie.
9.I’m sorry_________(给你添麻烦了).
10.The more careful you are，_________(更少的错误)you will make.
Keys:
used to的用法：
I.1.be 2.doing 3.are used 4.to cook 5.Did...use 6.didn’t use 7.staying 8.to work
II.1.There used to be 2.is used to chatting with/talking with 3.will soon get used to 4.used to sleep with the light on 5.Did,use to play