be interested doing/to do

　　interested to do　　 對(duì)做某事感興趣，想了解某事。

　　interested in doing　 對(duì)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(duì)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(zèng)加工資意味著增加購(gòu)買力。

　　begin(start) doing/to do

　　begin / start to do sth

　　begin / start doing sth.

　　1) 談及一項(xiàng)長(zhǎng)期活動(dòng)或開始一種習(xí)慣時(shí)，使用doing.

　　How old were you when you first started playing the piano? 你幾歲時(shí)開始彈鋼琴?

　　2) begin, start用進(jìn)行時(shí)時(shí)，后面動(dòng)詞用不定式to do

　　I was beginning to get angry.　我開始生起氣來(lái)。

　　3) 在attempt, intend, begin, start 后接know, understand, realize這類動(dòng)詞時(shí)，常用不定式to do。

　　I begin to understand the truth.　我開始明白真相。

　　4) 物作主語(yǔ)時(shí)

　　It began to melt.

　　感官動(dòng)詞 + doing/to do

　　感官動(dòng)詞 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do　 表示動(dòng)作的完整性，真實(shí)性；+doing 表示動(dòng)作的連續(xù)性，進(jìn)行性

　　I saw him work in the garden yesterday.　昨天我看見他在花園里干活了。(強(qiáng)調(diào)"我看見了"這個(gè)事實(shí))

　　I saw him working in the garden yesterday. (強(qiáng)調(diào)"我見他正干活"這個(gè)動(dòng)作)昨天我見他正在花園里干活。

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