Convert Simple sentences into complex sentences

1 Do you know the cost of this bicycle?

2 I request your help.

3 I have no where to sit.

1. Do you know the cost of this bicycle?    Can you tell me how much does this bicycle costs?

2 I request your help.  I request you to help me.

3 I have no where to sit. I do not have any place where I can sit and eat.