have to + verbo quer dizer que você precisa fazer. É uma regra, ou você não tem escolha.
have to + verbo
I have to be at school at eight.
We have to wear a uniform at work.
Not "I have be at school at eight." — say "I have to be at school at eight.". Diga have to, com o to, antes do verbo.
Experimente: Amina: Can I leave these boxes in the hall? Lars: No. The landlord checks the halls every week. We ___ keep them in our apartments. Escolha o que o Lars diz. (have / have to / don't have to) Resposta: have to — O proprietário confere os corredores, então guardar as caixas dentro não é uma escolha: Lars diz have to + keep. Só have fica sem o to, e don't have to transformaria isso em escolha.
Com he, she, it: has to
Com he, she e it, diga has to.
He has to leave at seven.
The doctor has to see ten people today.
Not "He have to leave at seven." — say "He has to leave at seven.". Com he, she e it, diga has to.
Experimente: Amina: Why is the man in 2B so busy? Lars: He ___ move out on Friday. Escolha o que o Lars diz. (have to / has / has to) Resposta: has to — Com he, diga has to + move. have to vai com I, you, we e they, e só has fica sem o to.
don't have to + verbo
don't have to + verbo quer dizer que não é uma regra. Você pode fazer ou não.
You don't have to call me. I'm fine.
We don't have to cook tonight.
Experimente: Amina: The library closes at eight. Is my book late? Lars: No. You ___ take it back today. You have two weeks. Escolha o que o Lars diz. (don't have to / have to / doesn't have to) Resposta: don't have to — A Amina tem duas semanas, então devolver o livro hoje é escolha dela: don't have to + take. have to diria que hoje é o último dia, e doesn't have to vai com he, she e it, não com you.
Com he, she, it: doesn't have to
Com he, she e it, diga doesn't have to.
She doesn't have to wear a uniform.
He doesn't have to work on Friday.
Not "She don't have to go." — say "She doesn't have to go.". Com he, she e it, diga doesn't have to.
Experimente: Amina: Does your friend go to a classroom for her English class? Lars: No. She ___ go. The class is online. Escolha o que o Lars diz. (don't have to / doesn't have to / has to) Resposta: doesn't have to — A aula é online, então ela não precisa ir a uma sala de aula, e com she você diz doesn't have to. don't have to vai com I, you, we e they, e has to mandaria ela para a sala de aula.
Perguntas: Do you have to? Does he have to?
Para perguntar sobre uma regra, diga Do you have to + verbo? Com he, she e it, diga Does he have to + verbo?
Do I have to buy a ticket? Yes, you do.
Does she have to study tonight? No, she doesn't.
Not "Does he has to go?" — say "Does he have to go?". Depois de does, diga have to, não has to.
Experimente: Amina: ___ I have to take off my shoes? Lars: Yes, please. The floor is new. Escolha a primeira palavra da Amina. (Does / Am / Do) Resposta: Do — Com I, uma pergunta sobre regra começa com Do: Do I have to take them off? Does vai com he, she e it, e Am não combina com have to.
Uma regra ou uma escolha
Você precisa fazer? Diga have to. Você pode escolher? Diga don't have to.
At this school, you have to wear a uniform.
You don't have to wear a tie, but you can.
Experimente: Amina: Can I go home now? Lars: Sure. You ___ stay. We can do it tomorrow. Escolha o que o Lars diz. (have to / don't have to / has to) Resposta: don't have to — Eles podem fazer isso amanhã, então ficar é escolha da Amina: don't have to + stay. have to prenderia ela lá hoje à noite, e has to vai com he, she e it.