be interested doing/to do
interested to do 對做某事感興趣，想了解某事。
interested in doing 對某種想法感興趣，doing 通常為想法。
I shall be interested to know what happens. 我很想知道發(fā)生了什么事。 (想了解)
I'm interested in working in Switzerland. Do you have any idea about that? 我對在瑞士工作感興趣。你想過這事嗎？ (一種想法)
mean to doing/to do
mean to do 打算、想
mean doing 意味著
I mean to go, but my father would not allow me to. 我想去，但是我父親不肯讓我去。
To raise wage means increasing purchasing power. 贈加工資意味著增加購買力。
begin(start) doing/to do
begin / start to do sth
begin / start doing sth。
1) 談及一項長期活動或開始一種習(xí)慣時，使用doing。
How old were you when you first started playing the piano? 你幾歲時開始彈鋼琴？
2) begin, start用進行時時，后面動詞用不定式to do
I was beginning to get angry. 我開始生起氣來。
3) 在attempt, intend, begin, start 后接know, understand, realize這類動詞時，常用不定式to do。
I begin to understand the truth. 我開始明白真相。