Помогите поставить предложения в отрицательную и вопросительную форму:

Ann is a journalist. This student has a good memory. professor Smith and Professor Black are colleagues. They are economists. The secretary is in the ofice. Bill has qestions to the lecturer. lecture halls are on the second floor. The problem is difficult. We have lectures on Friday. A scientist in an expert in natural sciences. A scholar is an expert in the humanities.

Ann is not a journalist. Is Ann a journalist?

This student doesn't have a good memory. Does this student have a good memory?

Professor Smith and Professor Black are not colleagues. Are Professor Smith and Professor Black colleagues?

They are not economists. Are they economists?

The secretary isn't in the office. Is the secretary in the office?

Bill has no questions to the lecturer. Does Bill have any question to the lecturer?

Lecture halls are not on the second floor. Are lecture halls on the second floor?

The problem is not difficult. Is the problem difficult?

We don't have lectures on Friday. Do we have lectures on Friday?

A scientist is not an expert in natural sciences. Is a scientist an expert in natural sciences?

A scholar isn't an expert in the humanities. Is a scholar an expert in the humanities?