Turn into negative-Passive-/Exercise

2. Change the following affirmative statements into negative statements. For example:
They would have been instructed to join us.
They would not have been instructed to join us.

It was sent on time.
It was not sent on time.

1. We could have been seen from the island.
2. It is being dealt with satisfactorily.
3. They were being kept under observation.
4. You will be held responsible.
5. They were expected at six o'clock.
6. He will be asked to participate.