（2）have作为完全动词还可以构成使役式，其形式为： have+名词或宾格代词+动词的过去分词。由于have是完全动词，所以其疑问句与否定句由do/did构成。与被动语态相似，使役式着重表示的是对某物（或某人）做了什么而不是某人做了什么。试比较：
用被动语态或使役式时，我们可能不知道或认为不必指明为我们服务的人是谁。然而，使役式比被动语态更加强调“使”别人为我们服务这一事实。我们要表示让别人为我们做某事时，通常不用主动语态。让别人给理发时，不可说I want to cut my hair而要说 I want to have my hair cut。
使役式也可以用以指人：
While I'm away, I'll have you looked after.
我不在的时候，我会让人照顾你的。
词汇学习 Word study
1．集合名词
集合名词表示的是由若干个体组成的集合体，如 family（家庭，一家人），team（队），crew（船、飞机等上的全体工作人员），audience（观众），government（政府），staff（全体职员／教员），class （班，班级）等。如果要强调作为整体的集体，则后面的动词用单数；如果要强调组成集体的每个人，则后面的动词用复数：
2．imagine vt.
（1）想像：
Can you imagine their surprise and delight?
你能想像得出他们的惊奇和快乐吗？
I thought I heard something, but perhaps I was imagining it.
我觉得我（好像）听到了什么动静，不过也许这只是我的想像。
（2）料想，猜想：
imagine you'd like to rest after your long journey.
我想你在长途旅行之后肯定愿意休息一下。
练习答案 Key to written exercises
1．关键句型练习答案
A had the plane packaged, (had the plane) moved, have the plane restored, have only three of them rebuilt
B 1 The French authorities had the plane packaged and moved in parts back to France.
2 A group of enthusiasts are going to have the plane restored.
3 The group will need to have only three of the engines rebuilt.
C 1 He is having a new house built.
2 She will have a new dress made.
3 I did not have the house decorated.
4 They had the washing machine repaired.
5 We must have this dangerous tree cut down.
6 We have to have this new television set installed.
2．难点练习答案
1 has 2 were 3 Have 4 is
3．多项选择题答案
1c 2b 3a 4a 5d 6a
7 a 8b 9a 10b 11b 12 a
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