Поставить каждое предложение в вопросительную и отрицательную формы и объяснить, почему так делается. 1) he has a daughter. 2) they have a son. 3) his friends have children. 4) this student has a red pencil. 5) these students have english books. 6) kotov has a good russian book.

Если сказуемое HAS, то используем вс глагол DOES, а основной глагол ставим в форму HAVE/
 Если сказуемое HAVE, то  используем вс глагол DO

1) He has a daughter. - He doesn't have a daughter. Does he have a daughter?
2) They have a son. - They don't  have a son. Do they have a son?
3) His friends have children. - His friends don't have children. Do his friends have children? 
4) This student has a red pencil. - This student  doesn't have a red pencil. Does this student have a red pencil?
5) These students have English books.  - These students don't have English books.  Do these students have English books?
6) Kotov has a good Russian book.