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【短语2】in response to
【点拨】in response to 回答，作为对……的回应。如:
The president visited the country in response to an invitation.
She opened the door in response to the knock.
【拓展】respond vi. 回应，响应；回答。构成短语:respond to回答，回应。如:
Many young people eagerly respond to the Party’s call to work in the border regions.
I offered him a drink but he didn’t respond.
热点语法聚焦
由于一般过去时、过去完成时、过去进行时三种时态的基本用法大家已经非常熟悉，本单元我们主要讲解各时态的特殊用法。
1. 一般过去时
(1)一般过去时表示现在的情形，在这种情况下，常用的动词有:know， think， expect， hope， plan， mean， intend等。如:
Oh， it’s you. I didn’t know you were here. (事实上，你现在就在这里)
I didn’t expect to be offered the post.(现在被给予了这个职位)
I thought you were busy.(其实你现在不忙)
(2)在时间或条件状语从句中，主句用过去将来时，从句用一般过去时表示过去将来。如:
He said he would phone me when he decided to visit me.
(3)表示过去经常发生的动作时常用used to或would +动词原形。如:
The boy would / used to go to the forest alone.
2. 过去完成时
(1)和另一个动词的过去时连用，表示两个过去动作发生的先后。如:
He had worked for three years before he went abroad for further education.
(2)表示从过去某一时间开始，一直延续到过去另一时间的动作，常与以下时间状语连用:by then， by the time， by the end of等。如:
By the end of last year， we had been friends for five years.
(3)It was / had been +一段时间+ since从句。since 从句用过去完成时。如:
It was at least three years since I had enjoyed a good drink.
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