OK I think I understand what the task is. I'll have a go.

CLASSWORK: KEY WORD TRANSFORMATION

the boss wouldn't object to you going early today
OBJECTION
the boss would not........ raised objection to .........you going early today

The boss would have no objection to you going early today.


we demanded to see the hotel manager to make our complaint
INSISTED
we..... have insisted to ...........the hotel manager to make our complaint

We insisted on seeing the hotel manager to make our complaint.


I'm sure it was Ana I saw in town as I recognised her coat
MUST
it...... must be......... Ana I saw in town as I recognised her coat

It must have been Ana whom I saw in town today, as I recognized her coat.


there's no point asking Lynda to help as she's really busy
WASTE
it's........a waste of time....... asking Lynda to help as she's really busy

Yup...that's how I'd say it...


I was too tired to go to the party
THAT
I was....... so tired that......... I couldn't go to the party

Yup...sounds good that way.