3、　 连接代词who, whom, whose, what, which，连接副词when, where, why, how， 它们起连接作用，作句子成分，各有自己的意义。

eg. The teacher asked the new students which class he was in.

　 I wonder where he got so much money.

[注意]1、由连接代、副词引导的宾语从句可以和“疑问词+不定式”结构转化。

eg. I don’t know how I should do with the presents. è I don’t know how to do with the presents.

2、　 连词if 、whether，它们起连接作用，在从句中不作句子成分，作“是否”解，在口语中多用if。

eg. Tom don’t know if/whether his grandpa liked the present.

　 He asked me whether or not I was coming.

一般情况下，if 和whether可以互换，但以下3种情况只能用whether：

　 ①在不定式前：Whether to go there or not hasn’t been decided.

②在介词前：It depends on(依靠) whether it is going to rain.

③与or not连用：They are talking about whether to go there or not.

1、　 连词that，只起连接作用，在从句中不作句子成分，也无词汇意义，在口语中常被省略。

eg. He knew (that) he should work hard.

100. As for me， it is essential to know，at first，what kind of problems young students possible would encounter on campus.

　　 我认为，首先应看看学生们在校园可能遇到哪些问题。

99. Although many experts from universities and institutes consistently maintain that it is an inevitable part of an independent life，parents in growing numbers are starting to realize that people， including teachers and experts in education，should pay considerable attention to this problem.

　　 尽管来自高校和研究院的许多专家坚持认为这是独立生活不可避免的一部分，然而越来越多的家长开始意识到包括教师和教育专家在内的人们应该认真对待这一问题。

98. In conclusion，we must take into account this problem rationally and place more emphases on peasants' lives. Any government that is blind to this point will pay a heavy price.

　　 总之，我们应理智考虑这一问题，重视农民的生活。任何政府忽视这一点都将付出巨大的代价。

97. It is suggested that governments ought to make efforts to reduce the increasing gap between cities and countryside. They ought to set aside an appropriate fund for improvement of the standard of peasants' lives. They ought to invite some experts in agriculture to share their experiences，information and knowledge with peasants，which will contribute directly to the economic growth of rural areas.

　　 建议政府应该努力减少正在拉大的城乡差距。应该划拨适当的资金提高农民的生活水平；应该邀请农业专家向农民介绍他们的经验，知识和信息，这些将有助于发展农村经济。

96. Many sociologists point out that rural emigrants are putting pressure on population control and social order；that they are threatening to take already scarce city jobs；and that they have worsened traffic and public health problems.

　　 许多社会学家指出民工正给人口控制和社会治安带来压力。他们正在威胁着本已萧条的工作市场，他们恶化了交通和公共卫生状况。

95. Although rural emigrants contribute greatly to the economic growth of the cities，they may inevitably bring about many negative impacts.

　　 尽管民工对城市的经济发展做出了巨大贡献，然而他们也不可避免的带来了一些负面影响。

94. It must be noted that improvement in agriculture seems to not be able to catch up with the increase in population of rural areas and there are millions of peasants who still live a miserable life and have to face the dangers of exposure and starvation.

　　 必须指出，农业的发展似乎赶不上农村人口的增加，并且仍有成千上万的农民过着缺衣挨饿的贫寒生活。