Mary stood at the school gate_______for betty.A.waiting B.to wait C.waited 我知道选A,想了解关于现在分词作伴随状语的知识,

现在分词作状语 (表示动作发生的时间、原因、结果、条件、让步、方式或伴随情况，通常相当于一个状语从句或并列分句。一般说来，这种结构的逻辑主语就是句子的主语。)

1. All night long he lay awake, thinking of the problem.
2. The six blind men stood there begging for a meal.
3. Her husband died ten years ago, leaving her with three children to look after.
4. He sat in the armchair, reading a newspaper.
5. Having eaten his dinner, the boy rushed out.
6. Not knowing her address, I can't write to her.
7. Taking the path that leads out of the town, you will come to a lake.
8. Hearing their teacher's voice, the pupils stopped talking at once.
9. Their car was caught in a traffic jam, thus causing the delay.
10. Having lived with the girl for 5 years, we all know her very well.
11. The children ran out of the room, laughing and talking merrily.
12. Turning to the left, you will find the path leading to the park.
13. Working hard, you'll succeed.
14. Having received his letter, I decided to write back.
15. Having eaten too much, he couldn’t go to sleep
16. Working so hard, he failed again.
17. They stood there for half an hour watching the stars in the sky.
18. She threw the toy on the ground, breaking it into pieces.
19. The song is sung all over the country, making it the most popular song.
20. They eat using the fingers of their right hands.
1)伴随 伴随 结果 伴随 时间
6)原因 条件 时间 结果 原因
11)方式 条件 条件 时间 原因
16)让步 伴随 结果 结果 方式

A
表示同时发生的动作，用ing形式。

分词作状语
主要看和主语的关系,
主动用现在分词
被动用过去分词