Details und Erklärungen zu modalen Hilfsverben und Verneinung finden Sie im Kapitel 6.

Bilden Sie die Pluralformen.
He could have been a doctor.
He could not have been a doctor.
They always have wanted to live by the sea.
They never have wanted to live by the sea.
She swims all day.
She does not swim all day.
The girl got the train.
The girl did not get the train.
You have been waiting for him for hours.
You have not been waiting for him for hours.
They have lived in a castle since 1798.
They have not lived in a castle since 1798.
He worked yesterday.
He did not work yesterday.
They are closing the bar, we should ask them to open again.
They are not closing the bar, we should not ask them to open again.
She had been having her exams right before, she went to France.
She had not been having her exams, right before she went to France.
We have been waiting for you here since ten, now it's twelve.
We have not been waiting for you since ten, now it's twelve.