1. shake hands with sb 和某人握手
2.start doing sth =start to do sth ;
begin doing sth= begin to do 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。
