课后练习：

1、What doesThanksgivingremindAmericans ?

A. in B. at C. up D. of

2、In America,onlyin a few cases live under one roof.

A. does more than one household B.do more than one household

C. more than one household

3、Many homes like a democracy.

A. run B. runned C. are run

4、Overhalf of U.S. marriages now end divorce.

A. to B. in C. at D. of

5、More than onein four American children in single-parent homes.

A. are growing up B.is growing up C. were growing up

6、They realizethat problems in family lifein recentyears

seriousconsequences.

A. have brought about B.has brought about

C. had brought about D.brought about

7、Not justin America, all over the world, people recognize theimportance of strong families.

A. but B. only C. in

8、If you have afamily，every day be Thanksgiving.

A. might B. would C.should D. could

关于本课：又是一篇关于美国家庭的文章。本课中现在进行时态应用较多，可重点学习下这部分内容的语法知识。还有就是有个以“only”开头的倒装句，顺便也熟悉下倒装句吧。

关于only倒装的用法

• 在句首的only后面跟了副词、介词短语或从句等状语时，句子用倒装结构，即“助动词或情态动词”提前至主语之前。例如：

1、Only then willI have a chance ofachieving my dream. 只有倒那时我才将会有机会实现我的梦想。

2、Only after abitter struggle wasthe aim achieved. 只有在艰苦的斗争之后目标才得以实现。

3、Only in thiswaycanyou learn Englishwell. 只有用这种方法你才能学好英语。

4、Only when thewar was over in 1918 was he able to get back to work. 只有在1918年战争结束时他才重回工作岗位。

• 如果only后跟的是主语，就不用倒装结构了。例如：

1、Only theteachers are allowed to use the room．（不用倒装结构） 只有老师们被允许使用这个房子。

2、Only five menwere hurt in the accident．（不用倒装结构）只有5个男人在这场事故中受伤。

还有就是only和所修饰的状语不在句首时，句子不使用倒装结构。例如：
1、Theboy was helped out only when his father arrived in a hurry.（不用倒装结构）只有当男孩子的父母匆忙赶到时，男孩才摆脱困境。