The usage of "have to "
I will talk about the usage of "have to". I will explain it in three aspects.
The first point: the meaning of have to?
"Have to "means "必須盆佣；不得不”
The second point: the basic forms of "have to "
Affirmative? form： have to/ has to / had to...
Negative form: don't? / doesn't /didn't have to...
Question form: Do / Does/ Did sb. have to...
Affirmative? form：
eg: I have to do the housework every day.
She has to do the housework every day.(Here you should change "have" into" has")
I had to do the housework yesterday.(Here you should change "have" into" had")
Negative form:
eg: I don't have to do the housework every day.(Here you should add "don't" to become a negative sentence.)
He doesn't have to do the housework every day.(Here you should add "doesn't" to become a negative sentence.)
We didn't have to the housework every day.(Here you should add "didn't" to become a negative sentence.)
Question form:
eg:? Do you have to do the housework every day?(Here you should add "do" to become a question sentence.)
Does he have to do the housework every day?(Here you should add "does" to become a question sentence.)
Did you have to the housework every day?(Here you should add "did" to become a question sentence.)
The third point：
the same and? differences between “have to "and " must"
the same points are they both mean "必須颤诀；不得不"
and you must use the basic form of verb after them.
The differences are :
The First one : "must" focus on subjective.? but "have to " focus on objective.
eg: We must be there on time.
I have to leave school because my family is poor now.
The second one: There are many forms of "have to" . But "must "has only one form.
eg:He had to look after his sister yesterday.
His father has to go to take care of him.
She must go with me.
The third one:
"Must" has the meaning of "一定是；必然”. But "have to "doesn't have this meaning.
eg:Your sister must be a doctor in this hospital.
The forth one:
"Mustn't "means "禁止“
"Don't have to "means "不必”
eg: You mustn't tell him about it.
You don't have to tell him about it.
