He has a computer.

(This sentence is correct)

She have a pet dog

>> She (has) a pet dog.

She is a teacher.

(This sentence is correct)

he is pitate

>> (He) is (petite.) (smaller than average height)

Thay are friend

>> (They) are (friends.)

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Basic Rule : Singular Subject takes singular verb; Plural subject takes plural verb.

*Don't forget to use proper punctuation marks.

* Be careful with your spelling. 

Hello Gideon! ^^

   Thank you so much for doing your homework. I am very happy that you always study and follow the teacher's instruction. Please take note of your corrections and always be good. ^^

~Teacher Cassie