1. State Verbs

2. Stative Verbs and Dynamic Verbs (Action Verbs)
English verbs can be divided into stative verbs and dynamic verbs (also called action verbs).   
Stative verbs are verbs that express a state rather than an action.
Examples:
be, seem, love, own, want, sound, have, know, understand.
Emily is sad.
Example sentences:
She is a great friend. He seems rather strange.
He wanted to see you. That sounds awesome!
We have enough things to do.

3. Stative verbs are usually not used in the progressive tenses
Stative verbs are usually not used in the progressive tenses. ( Any continuous Tense)
Examples:
Incorrect: He is wanting to see you. Correct: He wants to see you.
Incorrect: I am knowing what to do. Correct: I know what to do.

4. However, if the same verb is used to describe an actual action (not a state), than it can be used in the progressive tenses.
Examples:
When the verb "have" means "own" – it is a state. So we do not use it in the progressive tenses.
Incorrect: I am having a laptop.
Correct: I have a laptop.
When the verb "have" means "eat" – it is an actual action. So we can use it in the progressive tenses.
Correct: I am having lunch with Kate.
Correct: I have lunch with Kate.

5. Again
Some verbs (for example, know/like/believe) are not normally used in the continuous:
I’ve known about the problem for a long time. (not I’ve been knowing)
How long have you had that camera? (not have you been having)