1. Do he has a computer Should be: Does he have a computer? 2. Has he a computer? Correct grammer, but very archaic. This is the type of grammar used in Shakespeare's English. You can use it, but it will sound a little old and overly formal.

We use "Does he have a computer?" When asking Yes-No question like this , we need to be careful with subject verb agreement.I, You, We, They -----Do He,She, It------Does

The correct form is: - Does he have a computer? In questions of Present Simple sentence form we use "Does" for pronouns "He", "She" and "It". In questions the main verb ("to have" in this case) keeps its simple form.

The title should be "A basic question" - always put the adjective before the noun. He has a computer. 1. Do he has computer ? --> Does he have a computer? 2. Has he a computer ? -> incorrect, use 1. instead