PRESENT PERFECT CONTINUOUS
Esse tempo verbal é usado para indicar uma ação progressiva de um certo ponto no passado até o presente, e que tem possibilidades de continuar no futuro. A diferença entre o “Present Perfect Continuous” e o “Present Perfect” é que o primeiro expressa uma possibilidade maior da ação continuar no futuro e também apresenta ênfase na progressão da ação até o presente.
Exemplos:
Pamela has been working at the plant for months.
Judy and I have been studying English since last year.
PAST PERFECT
Usado para indicar que uma ação (Past Perfect) aconteceu no passado antes de outra ação (Simple Past) no passado.
Exemplos:
Joy had nished the article by 8:00 p.m.
She had never read that author before last night.
I tried to call her, but she had already left.
When I phoned she had just left.
Time Expressions: by, before + (point in time), just, already, never, after, when, before.
PAST PERFECT CONTINUOUS
Esse tempo verbal descreve uma ação progressiva, iniciando no passado e com término também no passado.
Exemplos:
By midnight, Claudia had already been working for twelve straight hours.
She had been working for fourteen hours when I called her at 2:00 a.m.
After she had been working for sixteen hours, she fell asleep.
She had been sleeping since 4:00 a.m. when she woke up at 8:00 a.m.
Before his stay in New York, he had been working for ten years in Los Angeles.
CONJUGAÇÃO DO “PAST PERFECT CONTINUOUS”
