英语写作中什么时候用非谓语动词开头,举例说说!

语写作中什么时候用非谓语动词开头,举例说说!
非谓语动词开头有以下几种
（1）Personally-speaking ; Generally-speaking ;
(2) In order to study English well ,We must study hard
(3) To learn English well is of great importance
(4) Given more time ,He will do this job much better
(5) unless invited ,He won't go to attend this meeting
(6) Watching TV is his hobby
(7) Laughing and talking ,these students walked out of the classroom

非谓语动词有四种形式， to do , doing ,do, done.
to do 放开头，两种情况：一种是to do 做主语。To study hard is the duty of a students.
一种是做状语，表目的To study hard, he stays up very lat...