The guests ...... (have) a great time for over an hour by the time the guest of honour arrives.

My sister ...... (work) for IBM for twenty years at the end of the year.

The President ...... (lead) the country for exactly seven years at the end of this month.

Professor Stainman ...... (teach) at the local university for over six years by the time he leaves for Africa next month.

The students ...... (study) the works of Shakespeare and his contemporaries for over two terms by the time they sit for their final exam.

The ambassador ...... (talk) about foreign politics for over an hour when Mr Brookleyn arrives.

My friends and I ...... (learn) Spanish for just three years when we finally take our certificate exam.

Mr and Mrs Jesperson ...... (live) in the small cottage in the mountains for over seven years when they finally get their gas heating.

The sales rep of our company ...... (stay) at the hotel for just over a week by the time he finishes the negotiations.

Dr Richardson ...... (operate) on the patient for over an hour when his wife makes a phone call to her secret lover.

Pete ...... (worship) the ground his Lilly walks on for over three years when she takes her school leaving examination.

David ...... (deliver) English classes for well over forty years when he realises that he's wasted away his life.

My cousin Freda ...... (paint) the garden fence for over three hours by the time her parents come home from work.

Dr Stewart ...... (negotiate) with the hospital for about six weeks when the hospital representative finally gives in to his demands.

My brother Marcus ...... (repair) broken water pipes for over five years when he finishes his secondary school.