cease to do 长时间,甚至永远停做某事.
cease doing 短时停止做某事,以后还会接着做
try to do 努力,企图做某事
try doing 试验,试着做某事
go on to do 做了一件事后,接着做另一件事
go on doing 继续做原来做的事
be afraid to do 不敢,胆怯去做某事,是主观上的原因不去做,意为"怕"；
be afraid of doing 担心出现doing的状况、结果
interested to do 对做某事感兴趣,想了解某事
interested in doing 对某种想法感兴趣,doing 通常为想法
mean to do 打算、想
mean doing 意味着
begin / start to do sth
begin / start doing sth