A noun clause can begin with relative pronouns such as that, what or when etc.
eg: That I was successful does not make me happy.
What we did was wrong.
Where you are going to lodge tonight is the problem.
My question is whether these sentences are possible.
1. Whom he likes most is his mother.
2. Whose book can be read is the problem.
3. How old she is should be mentioned.
4. With whom he trevelled is not known.
Hero of the day
Person asked the most questions.