Clauses

What are Independent (or Main Clauses) & what are Subordinate (Dependent) Clauses?

can u explain to me what is “cause” ???

Have you looked in a dictionary, Hajjar?
Or are you just asking questions and making comments so that you can spam people via PM?

I met him last week when I was going to London.

I met him last week > Main clause (A main clause is one that can stand on its own)
when I was going to London > Subordinate clause (A subordinate clause is one that cannot stand on its own; it needs to depend on the main clause to convey the complete meaning)

Compare and analyse:
We talked for about half an hour before we took leave of each other.