学些新单词对我很有用。

3．动名词和不定式作主语的区别

(1)动名词作主语通常表示抽象动作；而不定式作主语表示具体动作。

Smoking is forbidden here.这里禁止抽烟。(抽象)

It is not very good for you to smoke so much.

抽这么多烟对你身体很不好。(具体)

(2)动名词作主语时，通常用来表示一件已知的事或经验；不定式作主语通常用来表示一件未完成的事或目的。

Driving a car during the rush hour is tiring.

在高峰时刻开车令人厌烦。(经验)

To become a scientist is my dream.

成为一名科学家是我的梦想。(目的)

(3)不定式作主语，一般用it作形式主语，把作主语的不定式后置。

It is necessary to study a foreign language.

学习一门外语是必要的。

Ⅰ.单句语法填空

1．Fast food is full of fat and salt；by eating(eat) more fast food people will get more salt and fat than they need in their diet.(2017·全国Ⅰ)

2．This included digging up the road，laying(lay) the track and then building a strong roof over the top.(2017·全国Ⅱ)

3．But Sarah，who has taken part in shows along with top models，wants to prove(prove) that she has brains as well as beauty.(2017·全国Ⅲ)

4．I had as much fun sailing the seas as I now do working(work) with students.(2016·浙江)

5．In addition to their simple beauty，what makes the adobe dwellings admirable is their ability to "air condition" a house without using(use) electric equipment.(2015·全国Ⅱ)

6．Ignoring(ignore) the difference between the two research findings will be one of the worst mistakes you make.(2015·安徽)