参考答案

(1)Being able to (2)drinking (3)Copying (4)Drawing (5)Helping (6)Spending

2）．【全员探究】--教师点拨

Compare the differences between-ing form and to do form used as subject．

参考答案

(1)动名词作主语时，表示一般的，抽象概念；而动词不定式作主语，表示具体的特定情景下或有待于完成的动作。如：

①To finish such a long novel will take me several days．("to finish such a long novel"表示具体的、尚未完成的动作)

②Swimming is good for health，but to swim in such a polluted river is harmful to health．("to swim in such a polluted river"指特定情景下的动作)

(2)当it为形式主语时，两者常可以互用。如：

①It's difficult to make the air clean．

②It's difficult making the air clean．

(3)necessary，important等词后只用不定式。如：

①It is necessary to spend enough time on English if you want to learn it well．

②It is important to keep our classroom clean．

(4)no use，no good，a waste of time后常用动名词。如：

①It is no use crying．

②It is no good cheating in the exams．

③It is a waste of time reading a silly book like this．

Step 5．Homework

Finish the Grammar exercises in the Workbook on P85～86．