Noun Clause: I know who came.
Adjective Clause: I know the man who came.
Noun Clause: He doesn't understand why say so.
Adjective Clause: He doesn't understand the reason why I say so.
Noun Clause: Tell me when you will come.
Adjective Clause: Tell me the time when you will come.
Noun Clause: This is who went there.
Adjective Clause: This is the man who went there.
Noun Clause: Tell me how you will do it.
Adjective Clause: Tell me the way how you will do it.
