Past Perfect, Past Perfect Continuous

The lawyer...... (to prepare) all the documents by 4 o'clock yesterday.

We....... (to discuss) that problem for more than an hour before we found the right solution.

Clive ....... ( not to attend) computer courses before he entered university.

Polly....... (to study) economy since she entered university

When our delegation arrived at the university, the conference ...(already to begin).

Kevin was exhausted because he ..... (to unload) the lorry for three hours.

Pamela ... (not to finish) her project by the end of October.

Cathy and Sue ... ( to tidy) our cottage house for two days after that birthday party.

My sister ...( to practise) for two months before that concert.

The rain started after we ....(to catch) a taxi

Emily felt horrible yesterday because she ....(not to sleep) all night.

Mr Samuel .... (to agree) to help us after we ...( to explain) everything to him