I'm having a drink

(= I'm drinking: dynamic)

/ have a drink every evening before dinner.

(= I drink: dynamic)

Have got can never replace have used as a dynamic verb.

2 Have in the sense of 'take', etc. is used like any other English verb.
This means that:

- questions and negatives in the simple present and simple past
must be formed with do, does and did:
Do you have milk in your tea? I don't have milk in my tea
Did you have a nice holiday? I didn't have a nice holiday

Compare have meaning 'possess':

Have you (got) any milk in your tea? (= Is there any?)

/ haven't (got) any milk in my tea (= There isn't any.)

- it occurs freely in all active tenses as the context permits, but passive forms are rare: e.g. a good time was had by all

- the passive infinitive sometimes occurs in: e.g. / tried to buy some extra copies of this morning's newspaper, but there were none to be had (i.e. they were not available)

3 There are no contracted forms of have (= 'take', etc.) as a full verb in the simple present and simple past: / have a cold shower every morning (Not 'I've...') Compare have, meaning 'possess': / have/I've/I've got a new shower in my bathroom

4 The present and past perfect tenses of have involve the use of have as both auxiliary verb and main verb. For this reason, the present perfect and past perfect forms are given in full below.

10.34 Form of the simple present perfect of 'have' = 'take'

affirmative	short fo	rm	negative short fo	rms
/	have had	I ve	had	I've	not had	= I	haven't had
You	have had	You've	had	You've	not had	= You	haven't had
He	has had	He's	had	He's	not had	= He	hasn't had
She	has had	She's	had	She's	not had	= Shehasn't had l
It	has had	Its	had	It's	not had	= It	hasn't had
We	have had	We've	had	We've	not had	= We	haven't had
You	have had	You've	had	You've	not had	= You	haven't had
They	have had	They've	had	They've	not had	= They	haven't had