To form the negative, simply add "not" after "have" / "has":
subject + have / has + not + been + -ing form of main verb.
We can also use the contractions hasn't (has not = hasn't) and haven't (have not = haven't)
Examples:
He has not been sleeping well the last two months.
I've not been eating enough vegetables these days.
My boss has not been coming into the office regularly.
It hasn't been raining for very long.
You haven't been studying enough to do well in school.
Yes / no questions
To form questions use:
Has / have + subject + been + -ing form of main verb ?
Examples:
Has the baby been sleeping long?
Have they been working on the report?
Has your mother been staying at the beach house?
Have you been feeling better these days?
Have you been keeping to your diet or eating sweets?
Wh- questions
Notice the word order. The wh- questionword comes before "have" / "has" and then the subject and the past participle of "be" (been) and then -ing of main verb.
Examples:
What have you been doing these days?
Where has your daughter been living since she graduated college?
The past continuous tense, also known as the past progressive tense, refers to a continuing action or state that was happening at some point in the past. The past continuous tense is formed by combining the past tense of to be (i.e., was/were) with the verb’s present participle (-ing word).
There are many situations in which this verb tense might be used in a sentence. For example, it is often used to describe conditions that existed in the past.
The sun was shining every day that summer.
As I spoke, the children were laughing at my cleverness.
It can also be used to describe something that was happening continuously in the past when another action interrupted it.
The audience was applauding until he fell off the stage.
I was making dinner when she arrived.
The past continuous can shed light on what was happening at a precise time in the past.
At 6 o’clock, I was eating dinner.
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It can also refer to a habitual action in the past.
She was talking constantly in class in those days.
One final caution: Though the irregularities are few, not every verb is suited to describing a continuous action. Certain verbs can’t be used in the past continuous tense. One common example is the verb to arrive.