regret to do sth. 遗憾做了某事

go on doing sth. 继续做某事

go on to do sth. 接着做另一件事

try doing sth. 试着做某事

try to do sth. 尽量做某事

③allow/advise/forbid/permit + doing sth. 允许/建议/禁止/准许做某事；allow/advise/forbid/permit sb. To do sth. 允许/建议/禁止/准许某人做某事。

例：They don't allow smoking here.

They don't allow me to smoke here.

④need, require, want作"需要"解，其后用动名词的主动形式表示被动意义；be worth doing主动形式表示被动意义。

例：The flowers need watering.=The flowers need to be watered.

⑤短语devote to, look forward to, stick to, be used to, be busy in, have difficulty/trouble/problem(in), have a good/wonderful/hard time (in), there's no use/good/need, feel like, get down to等需用动名词形式作宾语。

例：We look forward to hearing from you soon.

⑥love, hate, prefer, like等动词后用动名词作宾语时指一般情况；跟不定式作宾语时指某一具体行为。

例：I like swimming, but I prefer diving.

1. 作定语，说明被修饰名词的特征，功能或作用。现在分词作定语则与被修饰的名词是主谓关系。

例：There is a large reading room in the library.

例1. If nothing _____, the oceans will turn into fish deserts.

A. does

B. had been done

C. will do

D. is done

解析：句意：如果不采取措施的话，海洋将会变成鱼的沙漠。本题考查被动语态。Nothing与do之间为被动关系，而且又是"主将从现"的句式，故选D项。

答案：D。

例 2. We are confident that the environment _____ by our further efforts to reduce pollution.

A. had been improved

B. will be improved

C. is improved

D. was improved

解析：句意：我们有信心，通过我们进一步减少污染的努力，环境会有所改善。考察时态。题干中的are表明语境是现在，空格处的动作是将来发生的，故B为正确答案。