start后的动词是否加ing

问题描述:

start后的动词是否加ing

11 begin(start) doing/to do begin / start to do sth /begin / start doing sth. 1) 谈及一项长期活动或开始一种习惯时,使用doing.例如: How old were you when you first started playing the piano? 你几岁...