状语从句的省略必须满足这2个条件吗?看到有人说：状语从句同时具备下列两个条件:①主句和从句的主语一致,或从句主语为it；②从句主要动词是be的某种形式.从句中的主语和be动词常可省

Question

状语从句的省略必须满足这2个条件吗?
看到有人说：
状语从句同时具备下列两个条件:①主句和从句的主语一致,或从句主语为it；②从句主要动词是be的某种形式.从句中的主语和be动词常可省略.
那么,我想问的是：如果满足条件①,而不满足②的情况下,是否就可以省略从句主语（若从句主语是it,则it 也可省略吗）
看了1楼的回答，能否多举几个例子啊？

Answer 1

只需满足条件①,而不必满足条件②,状语从句就可省略主语而改为分词形式.如：After he had finished his assightment,he went homes.此句可变为：After having finished his assightment,he went home.
Being very tired,they stopped to rest.