语法小练习When she saw the big snake,the girl was almost frighten

When she saw the big snake,the girl was almost frightened to death.
On seeing the big snake,the girl was almost frightened to death.(现在分词做伴随状语)
或者When saw the big snake,the girl was almost frightened to death.(省略重复的主语,可以和后面的句子共用一个主语)
If time permits,I will stay another week.
Time permitting,I will I will stay another week.（独立主格结构）
After he waited in the line for half an hour,he suddenly realized that he left his wallet at home.
After waited in the line for half an hour,he suddenly realized that he left his wallet at home.（省略重复的主语,可以和后面的句子共用一个主语）
Not knowing what to do next,he turned to the teacher for help.
Since he doesn’t know what to do next,he turned to the teacher for help.(since 引导原因状语从句,就把原来省略的东西补全了.Since也可以用as或者because代替)
Working hard,you will succeed one day.
If you work hard,you will succeed one day.(if 引导条件状语从句.如果不限制空格字数,可以写成as long as you work hard)
When he woke up,he found he was lying in bed.
When he woke up,he found himself lying in bed.(find sb.doing sth.)

1 Sawing 2 time permiting 3 Having waited 4 5 If you work hard 6 himeself lying

When she saw the big snake, the girl was almost frightened to death.
Seeing the bigsnake, the girl was almost frightened to death.
If time permits, I will stay another week.
Time permiting...