Not "They has two children." — say "They have two children.". Has is only for he, she, it, with they, use have.
Try it: They ___ two children. (have / has / haves) Answer: have — If you picked "has", that form is only for he/she/it. With they, use have: They have two children.
He / she / it: has
With he, she, it, use has.
He has a bike.
She has brown eyes.
The cat has four legs.
Not "She have brown eyes." — say "She has brown eyes.". Has is the form that tells you it is he, she, or it.
Try it: Matilda ___ a dog. (has / have / haves) Answer: has — Matilda = she, so use has.
have or has?
Before each one, ask: who? he/she/it → has. I/you/we/they → have.
He has a car. / They have a car.
She has time. / We have time.
Not "He have a car. / They has a car." — say "He has a car. / They have a car.". Same word, the subject decides have or has.
Try it: Hiroshi ___ a book. Amina and Mei ___ a book. (has … have / have … has / has … has) Answer: has … have — Hiroshi = he → has. Amina and Mei = they → have.
I've got = I have
In speech you will also hear I've got and she's got. They mean the same as I have and she has.
I've got a sister. = I have a sister.
She's got a dog. = She has a dog.
We've got two cats. = We have two cats.
Try it: Camila says: I've got a brother. What does she mean? (I have a brother. / I am a brother. / I want a brother.) Answer: I have a brother. — I've got means the same as I have. The 've is short for have, so Camila is saying what she has.
Negatives: don't have
With I, you, we, they, use don't have.
I don't have time.
We don't have a car.
They don't have a key.
Not "I don't has time." — say "I don't have time.". After don't, the word goes back to have, never has.
Try it: We ___ a dog. (don't have / doesn't have / don't has) Answer: don't have — With we, use don't, and after don't the word is have.
Negatives: doesn't have
With he, she, it, use doesn't have (the change goes into doesn't).
He doesn't have a car.
She doesn't have time.
Not "She doesn't has a car." — say "She doesn't have a car.". Doesn't already carries the change, the word goes back to have.
Try it: Liam ___ a pen. (doesn't have / doesn't has / don't have) Answer: doesn't have — Liam = he, so the change goes into doesn't, and the next word stays have. Neither "doesn't has" nor "don't have" matches he.
Questions: Do / Does + have
Start with Do (I/you/we/they) or Does (he/she/it), then have.
Do you have a pen?
Does she have a car?
Not "Does she has a car?" — say "Does she have a car?". After Does, the word is have, the change is already in Does.
Try it: ___ Sofia have a pen? (Does / Do / Is) Answer: Does — Sofia = she, so the question starts with Does.
Try it: Remember: who is it? Mei ___ three books. (has / have / haves) Answer: has — Mei = she → has. (This is the choice everything else builds on: he/she/it → has.)