Some verbs called ďstateĒ describe a continuing state, so donít usually have a continuous form. Typical examples are:
be, believe, belong, consist, contain, cost, doubt, fit, have, know, like, love, matter, mean, own, prefer, understand, seem, suppose, suspect, want, wish
Some of these verbs can be used in continuous form with a change of meaning.
Tim is being rather difficult at the moment. (behave)
Iím having breakfast. ( eat)
Iím tasting the soup, to check if it needs more salt. (sample)
Iím thinking of bying a new car. (consider)
Some verbs have a stative meaning and a different active meaning. e.g.
be, depend, feel, have, measure, see, taste, think, weigh
Jack is noisy. (state) Jack is being noisy. (event)
She has a Porsche. / We are having an interesting conversation.
I think I like you! / David is thinking about getting a new job.
This fish tastes awful! / Iím just tasting the soup.
I feel that your wrong. / Iím feeling terrible.
This bag weighs a ton! / We are weighing the baby.
It depends what you mean. / Iím depending on you.
Have canít be used in the continuous form when it means possession.
I have a flat. NOT Iím having a flat.
Hope that helps.