Wah How to use "Have got to"

We know that have to is used for expressing a strong obligation or to give an idea of deduction when we are sure something is true from some evidence in this topic Wah How to use "Must and Have to"

Have got to has the same meaning as have to.
Have got to is used in British English much more than in American English.

Even though have got to has the present perfect form. In fact it is a present tense.

Affirmative    
    I have got to lose weight
    We have got to pay all our bills today.
    Maria has got to work so hard this week.

Negative
    I haven't got to lose weight
    We haven't got to pay all our bills today.
    Maria hasn't got to work so hard this week.

Interrogative
    Have I  got to lose weight?
    Have we got to pay all our bills today?
    Has Maria got to work so hard this week?

Wah How to use "Must and Have to"

Affirmative	Negative	Interrogative
I have to go.	I don't have to go.	Do you have to go?
He has to go.	He doesn't have to go.	Does she have to go?
I must go	I must not go.	Must you go?
He must go.	He mustn't go.	Must she go?

1. We use must or have to to express a strong obligation or necessity base on the rule,an authority or circumstances.
    I have to tell you that I love you. = I must tell you that I love you.
    She has to clean up this room. = She must clean up this room.
    It is close to seven o'clock. We have to go to school.
    The traffic is very bad, we have to take the subway instead.

2. We can also use must or have to with the idea of deduction when we are sure something is true from some evidence or reason.
(More example here: Wah How to use "Must/Might/May/Can't be")
    This meal has to be delicious.
    Mark is a English teacher, he must know a lot of English grammars.

3. Have to can be used in the past or the future.
    Yesterday,I had to work all day. I musted work all day is incorrect.
    Did he have to go to school on last Saturday.
    We will have to get up early.
    Will I have to speak with her?