(You can learn about the difference between state and action verbs here.)

She's eating an apple - it tastes delicious (action and state).

Practice 1: verbs which can be states or actions

Remember: state verbs are never continuous. However, some verbs can be states or actions, depending on the situation. In the sentences below, if it is an action, choose the continuous form. If it is a state, choose the simple form.

 what you mean. ( = understand)
 a psychologist at the moment. ( = meet regularly)
Bob  very unfriendly today. Normally he's lovely.
Bob  really nice. Everyone always loves him.
Mmm. That cake  delicious.
What  at?
The students  to understand this grammar.
Brad Pitt  in 'Hamlet' in a theatre in London for 2 weeks.

Practice 2: action or state

Are these states (simple form) or actions which are temporary or in progress now (continuous)?
 the shoes you're wearing.
Don't turn off the TV. I  this film.
 fun at the moment.
 a job at the moment.
 him £50.
Don't talk to Tom. He  .
John's outside at the moment. He  the grass.
 your brother when I lived in Paris.
This film  interesting. Shall we watch it?
This website  a lot of grammar.
This computer  £1,200.