PRESENT PERFECT CONTINUOUS

If you do not spend your time looking at people intently, and over long periods of time, and you are not the kind of person to fill your stomach with just any kind of food, this piece of text is for you. We study guidance on the Present Perfect Continuous — critically.

We read the advice from
EDUCATION FIRST,
the PRESENT PERFECT CONTINUOUS

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"The present perfect continuous tense is used to refer to an unspecified time between before now and now; actions that started in the past and continue in the present."
Example A:
She has been waiting for you all day.

"Actions that have just finished, but we are interested in the results"
Example B:
She has been cooking since last night.

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Granny has a reservation.
We could hear or read, in everyday and correct English,
She has been reading for an hour.

The grammatical Aspect is about the grammatical time. It is not about telling the hour. Whether it is the Simple, the Progressive, the Perfect, or the Perfect Continuous, and whether it is the grammatical PRESENT, FUTURE, or PAST, the hour or time span will not guide us on language use.
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When you read grammar guidance, evaluate if it is proper. Here, the time span is irrelevant and it should not have been made part the grammar advice.

Further, grammar guidance should not use CLICHÉS. We might have to look for someone "all our lives" or try a war zone, to find anyone who would wait "all day".

Then, we would have to look at them, all that day. I mean, if we went as grossly general on time as to say "all day" for no reason at all, we might discourage intelligent people from communicating with us.
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Grammar also is not a tool to evaluate on taste or esthetics. There are no grammar structures to use only when the weather is "nice", food is "good", or the music "pleasant".

We can be back to Education First. We can use the Present Perfect Continuous, "when actions have just finished, but we are interested in the results", they say.
Example: She has been cooking since last night.
Well, grandpa would skip a seaweed legume, and if he would have lentils, it would be from a can, because they take too long to cook well from raw, he says. This is to mean, if we are not interested in the results, we use the same grammar, only with the Negative, in most cases. It is the character and duration of activity the grammatical Aspect renders.

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Read from our pages, how we make the Perfect Progressive. "Progressive" is another label for "Continuous".
GRAMMAR TRICKS: PERFECT PROGRESSIVE