studytodosth正确吗
try to do sth是什么意思
get to do sth什么意思
manage to do sth是什么意思
help do sth和help to do sth的区别
struggle to do sth
ability to do sth什么意思
learn to do sth是什么意思
try to do sth
aim to do sth
fail to do sth