1. Mike eats ice-cream every day. Look, he is eating ice-cream now. When I saw him in the morning, he was eating ice-cream, too. He said he had eaten one ice-cream already by that time. I think he will fall ill if he eats so much ice-cream.
2. They were walking along the street and talking. Suddenly Nick stopped and said: "Oh, what shall we do? I have lost the key to the door." "If you don't find it," said Pete, "we shall have to wait for mother in the street."
3. When I came to the station yesterday, I learnt that my train already has already left.
4. What was he doing when you saw him yesterday?
5. I shall give you this book as soon as I finish reading it.
6. When the ship was crossing the ocean, a great storm broke out.
Science fiction writers wrote about different wonders and robots. But robots are not a reality. Where are our robots which help us to do the ironing, cook dinner, walk the dog, clean the house and so on? Perhaps it is much more difficult in practice than in theory to build such a robot. Our scientists don't have the knowledge to give a robot intelligence or the power of reasoning. Perhaps they may never work it out. Researchers say that the best way to overcome this problem is to study the human brain and try create an artificial brain. Nevertheless, scientists have already overcome other problems such as mobility. Also, robots can now look more human. Language may be another problem as robots have to be able to understand man's speech. Experts are divided as to when robot assistants may become a reality. Some ofscisay five years, others say fifty. Maybe soon household robots may be as common as home computers.