Ought to
ought to
Has to
Must to
Have/Has
When we have the negative form of "have to " (don't/ doesn't)
Doesn't have to
Have to
Don't have to
Don't/Doesn't have to
We use it to say that is not necessary to do something but we can do it if we want
We use it to say that is necessary to do something
We ----- be quiet in the library
My mom ------- help me with my work
It's used to replace have to, but in a formal way
You ------ wake up early on the weekend
A teacher ------ make all its planifications at time
I ----- make this proyect
The part of "have to ", doesn't change, it stays normal
It has a authority level higher than have to