Noun Clause

• How Pat is feeling today ?

          I don't know how Pat is feeling today

• Why did they leave the country is secret ?

          I don't know why they leave the country is a secret

• Is there life on other planet ?

          I wonder there is life on other planet

• Did you leave your dictionary at the library ?

          I don't know i left my dictionary on the library

• Does it belong to you ?

          I don't know it belong to me