现在分词就是"动词+ing", 而过去分词就是“动词+ed"
现在分词与过去分词在句子中共有四种语法作用，而且用法相同。
1) 作定语：
The meeting held yesterday is important.
The man talking with our teacher is my father.
2) 表语： The news is exciting.
We are excited.
The story is moving. We were
moved to tears by the story.
3) 宾补： I’ll have my watch repaired.
I heard her singing a song in English when
I came in.
4) 状语：
分词短语作状语时，可以表示时间、原因、条件、伴随状况等，要根据上下文理解。
Being a student, I must study hard (原因状语) .
The boy lay on the ground, staring at the
sky.（伴随状语）
The teacher stood there, surrounded by the
student.（伴随状语）
Badly polluted, the water can’t be drunk..（原因状语）
aving lived such a hard life, the poor of cities
took up their guns.（原因状语）
Having been kept a prisoner in the Bastille for
years，Dr. Manette had been set free lately.
Asked，I would like to answer the question.
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