非谓语的定义
位置 执行者及与其关系 结合位置讨论动作的时间性
1. 主语
1) doing learning english is important.
your learning english is important.
for them to have been invited to the party is nice.
to do to learn english is important.
for a chinese to english is important.
note: a) it is it is no use/good not any good/use
b) t