動(dòng)詞不定式 8
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(jiàn)他在花園里干活了。(強(qiáng)調(diào)"我看見(jiàn)了"這個(gè)事實(shí))
I saw him working in the garden yesterday. (強(qiáng)調(diào)"我見(jiàn)他正干活"這個(gè)動(dòng)作)昨天我見(jiàn)他正在花園里干活。
典型例題
1) They knew her very well. They had seen her ___ up from childhood.
A. grow B. grew C. was growing D. to grow
答案：A. 因題意為，他們看著她長(zhǎng)大，因此強(qiáng)調(diào)的是成長(zhǎng)的過(guò)程，而非正在長(zhǎng)的動(dòng)作，因此用see sb do sth。的句型。
2) The missing boy was last seen ___ near the river.
A. playing B. to be playing C. play D. to play
答案：A. 本題強(qiáng)調(diào)其動(dòng)作，正在河邊玩，應(yīng)此用see sb. doing sth句型。