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Para negar solo se usa "hasn´t" o "haven´t":
I haven´t worked in that factory for many years.
She hasn´t gone to her house recently.
He hasn´t written a letter to them lately.
Para preguntar:

Have I worked ...?.
Has she gone...?.
Has he written...?.

Present perfect continuous (present perfect continius) (presente perfecto continuo)
= se usa para decir que una acción empezó en un punto del pasado y todavía
continua en el presente.

pasado presente
(empezó una acción) (y continua en el
presente)

Construcción de una oración afirmativa:

Persona + have/has + been + acción en presente con terminación en "ing" +
información + palabra adicional.

Palabra adicional = today, all day, for, since, recently, lately, this week, this month,
this year, etc.
Ex:
He has been studying english for 2 years.
(ji jas bi..n studing inglish for tu yi..rs)
(el ha estado estudiando inglés por dos años)

They haven´t been working hard recently.
(dei javent bi..n working jard wricentli)
(ellos no han estado trabajando duro recientemente)

Have you been swimming since 5:00 am?.
(jav iu bi..n swiming sins faiv ei. Em.?)
(has tu estado nadando desde las cinco a. M.?)

Advanced 1 english practice, unit 7
"presente perfect and continuous"
Complete the following sentences as it is required in parenthesis:

1) They _____________(han trabajado) in that company for many years.
2) She _____________(no ha ido) to her house recently.
3) He _____________(ha estado) studying english for 2 years.
4) They ____________(no han estado) working hard recently.

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