Question

I have walked fast .I was tired change into participle clause​

Answer 1

I was tired as I walked fast.

Answer 2

By converting it into participle clause: Having walked fast, I was tired.

Explanation:

A participle is used to connect or combine two sentences. Before using a participle to combine two sentences, one must note if those two sentences have the same subject.  

For example: Looking through the window, she saw them coming is a participle clause.  

In this case, I have walked fast. I was tired. These two sentences have the same subject.