be interested doing/to do

　　interested to do　　 对做某事感兴趣，想了解某事。

　　interested in doing　 对某种想法感兴趣，doing 通常为想法。

　　I shall be interested to know what happens. 我很想知道发生了什么事。 (想了解)

　　I'm interested in working in Switzerland. Do you have any idea about that? 我对在瑞士工作感兴趣。你想过这事吗?　 (一种想法)

　　mean to doing/to do

　　mean to do　 打算、想

　　mean doing　意味着

　　I mean to go, but my father would not allow me to. 我想去，但是我父亲不肯让我去。

　　To raise wage means increasing purchasing power. 赠加工资意味着增加购买力。

　　begin(start) doing/to do

　　begin / start to do sth

　　begin / start doing sth.

　　1) 谈及一项长期活动或开始一种习惯时，使用doing.

　　How old were you when you first started playing the piano? 你几岁时开始弹钢琴?

　　2) begin, start用进行时时，后面动词用不定式to do

　　I was beginning to get angry.　我开始生起气来。

　　3) 在attempt, intend, begin, start 后接know, understand, realize这类动词时，常用不定式to do。

　　I begin to understand the truth.　我开始明白真相。

　　4) 物作主语时

　　It began to melt.

　　感官动词 + doing/to do

　　感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do　 表示动作的完整性，真实性；+doing 表示动作的连续性，进行性

　　I saw him work in the garden yesterday.　昨天我看见他在花园里干活了。(强调"我看见了"这个事实)

　　I saw him working in the garden yesterday. (强调"我见他正干活"这个动作)昨天我见他正在花园里干活。

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