Ex1: Find and correct the mistake in each sentence:
1. You ought obey the rules in school
2. Although asking my teacher, I can not understand this exercise
3. What about going to the cinema by foot? - It's a good idea
4. There are a lot of traftics in the city
5. English speaks all over the world
Ex2: Rewrite the sencond sentence so that it has same meaning as the first
1. He had a modern robot once-he used