8.11 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(kāi)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(kāi)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(kāi)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(kāi)始明白真相。
4) 物作主語(yǔ)時(shí)
  It began to melt.