請問這些句子怎麼改成分詞構句？

1. Not hearing from him, I tried to get in touch with him.
2. Arriving at the station, we found they were waiting for us.
3. 不能改成分詞構句 (it could if you replace "even if" by a preposition "despite")
e.g. Despite granting what she said is true, I still can't trust her.
4. Being left to himself, the little boy began to cry.
5. Having finished his work, he went to bed.

When you've the subordinating construction shown already with the past perfect; the later denotes 
(1)the first action which took place before another action in the past
(2)an action completed before a stand-point in the past.
All in the past perfect:-
eg:-
(1)Because I had not heard from him, I tried to get in touch.
(2)When we had arrived at the station, we found they were waiting for us.
(3)Even if I believe her, I still can't trust her.
(4)When he was left alone, the little boy began to cry.
(5)When he had finished the work, he went to bed.