从句要使用虚拟语气，即从句谓语用"should＋do"，should可省略。

　We'd better accept his suggestion that we(should)make good use of every minute.

　我们最好接受他的建议，好好利用每一分钟。

3．名词doubt(怀疑)后可跟同位语从句，若用于肯定句中时用whether引导；若用于否定句中时则用that引导。

　There is some doubt whether they will come to help us.他们是否能来帮助我们还不确定。

　There's no doubt that Taiwan belongs to China.毫无疑问台湾是中国的领土。

四、同位语从句与定语从句的区别

1．同位语从句对先行词作进一步的解释说明；而定语从句对先行词起修饰或限制作用。

　The foreigner expressed the hope that he would come to China again.(同位语从句)

　I'll remember the hope that the foreigner expressed to me.(定语从句)

2．同位语从句的先行词通常是抽象名词，而定语从句的先行词无此限制。

　The possibility that scientists can clone a man may come true.(同位语从句)

　This is the horse that the scientist cloned.(定语从句)

3．that引导同位语从句在句中不作成分，通常不能省略，只起连接作用。that引导定语从句时为关系代词，它除了起连接作用外，在从句中还要充当某一成分(如主语、宾语等)，作宾语时可以省略。

　He made a promise to his son that he will buy a bike for him.(同位语从句)

　I still remember the promise(that)he made.(定语从句)

达标练习：

1用适当的连接词填空

1．The news________we won the game made all of us excited.

2．He asked a question________we should have the party.

3．We are discussing the problem________he will come or not.

4．Actually I had no idea________it was true.

5．He has no idea________he should do next.

6．The problem________she was so sad made us puzzled.

7．I have some doubt________he will pass the driving test；he hasn't trained much.

8．The doctor gave me some advice________I should stay at home for a good rest.

9．We all had no idea________would take the place of our former boss.