a) Some verbs are non - action verbs, i.e they don’t do anything; for example, I like ice cream or I want a coffee. These are known as state or stative verbs as opposed to dynamic verbs, where the person is actively doing something e.g. I am drinking a coffee. See, smell, hear, think and similar verbs usually take the present simple aspect, but the present continuous aspect exists for: pretence or miming, e.g. I'm smelling the roses, a developing situation, e.g. I'm hearing a lot better these days, suggesting a progressive event e.g. I'm feeling sick, suggesting a deliberate action, I'm thinking about changing my job soon.
b) The most common state verbs are to be, to have, to know to like, to love etc. However, some state verbs can also be used in the continuous aspect.
·To be is used with adjectives of behaviour - you are being silly, which suggests a temporary act.
·To have has two uses. Have when describing a present experience can be used in the continuous, e.g. I'm having a shower. However, have to indicates possession or referring to health is not used in the continuous aspect e.g. I have two brothers. I have a headache.