1.+My friend was at the party yesterday.
-He wasn't at the party yesterday.
?Was my friend at the party yesterday?
2.+He visited me last week.
-He didn't visit me last week.
?Did he vizit you last week?
3.+Ann went to the country by car.
-Ann didn't go to the country by car.
?Did Ann go to the country by car?
1. I have gone to the shop. I am still there.
2. My classmates have gone to the football field. They're still there.
3. Your cousins have been to America four times. They have already come back home.
3 They offered the idea of a drawbridge long time ago.
The designer has to calculate carefully how they would distribute various loads.
The iron bridge crossed the British river Severn.
People build tunnels to providerouts for transport
Someone did the first suggestion to construct a tunnel a century ago