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There are also a number of verbs that don't take the continuous forms in one meaning but DO take the continuous forms in other meanings. Here are some of the most important:

Non-Continuous Meanings

feel = 'have an opinion' - He feels he should get a second chance.
see = 'understand' - I see what you mean.
think = 'have an opinion' - I think we should leave immediately.
appear = 'look like' - That appears to be stale.
look = 'seem' - It looks impossible!
taste = 'have a taste' - That tastes yummy!


Continuous Meanings

feel = 'feel physically' - I'm feeling awful this afternoon.

see = 'visit' - She's seeing a doctor this morning.
think = 'use the brain' - He's thinking hard about the problem.
appear = 'be on stage / perform' - Jack Daniels is performing at the Paramount tonight.
look = 'stare at' - I'm looking at that strange man.
taste = 'use the mouth' - The cook is tasting the sauce!

1. http://esl.about.com/od/grammarintermediate/a/noncontinuous.htm


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The Past Perfect Progressive Tense [2]

When creating negative sentences, we use the auxiliary (helping) [verb]- hadn’t (had not) + been + the ing (present participle) form of the verb.

I hadn’t been feeling well, so I sent him away.

2.http://www.gingersoftware.com/content/grammar-rules/verbs/the-past-perfect-progressive-tense/

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