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There are some verbs which can't be used in a continuous context; they are usually only used with simple verb forms.

The verbs don't usually imply a concrete action.
Here are some examples of verbs that are not compatible with continuous tenses:
want
love
need
see
hear
realise
know
believe
understand
seem
like
prefer
Offers

We have learnt that the future 'will' is used to describe things that are certain to happen in the future.
'Will' can also be used to offer something.
Examples:

I'll help you. (with that heavy suitcase)
I'll open the door for you. (to an elderly person)
I'll pay. (It's my treat for you)
Examples:

I'll help you. (with that heavy suitcase)
I'll open the door for you. (to an elderly person)
I'll pay. (It's my treat for you)
Introduction to Present Perfect Continuous

We use the present perfect continuous tense to describe something which started in the past and has continued up until this moment.

We usually include the following time phrases:
for ten minutes. since one o'clock.

We can also use this tense without those time phrases to give the sentence a more general feeling. This tense is never used to describe completed actions in the past, not even in the interrogative form.
Remember: As this is a continuous tense, we must only use verbs that are compatible with continuous tenses.
Present Perfect Continuous

As we know, the verb 'be' plus a gerund makes a tense continuous, therefore the structure is simple:

I + have/has + been + gerund...
Examples:

I have been feeling tired lately.
He hasn't been doing his homework.
Have they only been sleeping for ten minutes?
If there is an adverb in the sentence, it comes before the verb 'been'.