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In English there are 12 forms of infinitives:

Mustn't and don't have to are completely different:

Should is not as strong as must:

You can use 'have got to' instead of 'have to':

You should do something = it is a good thing to do or the right thing to do:



I didn't need to...= it was not necessary for me to... (and / knew this at the time):

In English Infinitive has 16 forms:

In questions and negative sentences with have to, we normally use do/does/did:

In their primary function, modals closely reflect the meanings often given first in the dictionaries:

Infinitives are always used with to:

Instead of needn't you can use don't/doesn't need to:

Modals can be arranged on a scale from the greatest uncertainty (might) to the greatest certainty (must):

Nine of the modal auxiliaries (not shall) can be used to express the degree of certainty (uncertainty) a speaker feels about a possibility:

To offer to do something, we sometimes use Can/...:

Verbs like can and may are called modal auxiliaries, but we often refer to them simply as modal verbs or modals:

We use modals when we are concerned with our relationship with someone else:

Wheather + infinitive can be used similarly after want to know, wonder:

When the thought concerns a previous action we use the perfect infinitive:

You must do something' means it is necessary that you do it: