Third-year

The teacher is in charge of the third-year class.

That teacher is in charge of the third-year class.

My uncle is in charge of the third-year class.

I am in charge of the third-year class.

Tom is a third-year student.

Tom is a third-year law student at Harvard.

Tom is a third-year law student.

I think that Tom is a third-year law student.

I think Tom is a third-year law student.

Tom is a third-year student, isn't he?