More than 2000 years ago, pythagoras discovered that musical intervals using simple ratios.

2) 1      I couldn’t open the suitcase because I had lost the key.

2          She had a good tan because she had been sitting in the sun all morning.

3          Paula couldn’t use her debit card because she had forgotten her PIN number.

4          We had been waiting for over an hour before the repair truck arrived.

5          When the policeman asked for my ID card, I said I had left it in my hotel.

6          Their boots were dirty because they had been playing football all morning.

7          I couldn’t stop the car because the brakes had failed.

8          The garden was all white because it had been snowing heavily all night.

9          She started to cry when I told her her dog had died.

10        I got to work late because I had woken up late that morning.

4) I found this story while I was reading Spotlight the other day: ‘In 1986, a Canadian man rose from the sofa where he had fallen asleep, drove 14 miles, killed his mother-in-law and seriously injured his father-in-law. He was charged with murder but acquitted when a court had accepted his lawyer’s argument – and his physician’s evidence – that he had been sleepwalking.’

1 I couldn’t open the suitcase because I had lost the key.

2 She had a good tan because she had been sitting in the sun all morning.

3 Paula couldn’t use her debit card because she had forgotten her PIN number.

4 We had been waiting for over an hour before the repair truck arrived.

5 When the policeman asked for my ID card, I said I had left it in my hotel.

6 Their boots were dirty because they had been playing football all morning.

7 I couldn’t stop the car because the brakes had failed.

8 The garden was all white because it had been snowing heavily all night.

9 She started to cry when I told her her dog had died.

10 I got to work late because I had woken up late that morning.

I found this story while I was reading Spotlight the other day: ‘In 1986, a Canadian man rose from the sofa where he had fallen asleep, drove 14 miles, killed his mother-in-law and seriously injured his father-in-law. He was charged with murder but acquitted when a court accepted his lawyer’s argument – and his physician’s evidence – that he had been sleepwalking.’