I agree with the idea that in the future robots will be very useful to us. Firstly, home robots will be able to do all of our housework. Secondly, teaching robots will be able to help children do their homework. Next, worker robots will be able to build houses in the air; doctor robots will be able to help sick people; space robots will be able to build space stations on many other planets. Finally, robots will be able to do dangerous work for us. For these reasons, I think that robots will be useful in our future. 

There are home robots, teaching robots, worker robots, doctor robots and space robots.
I think home robots will be able to guard our house. They will be able to recognize our faces and if they find someone strange, they will sound an alarm to warn us. About education, teaching robots will be able to help students study many subjects like Maths, Literature, English and Geography. In my opinion, worker robots will be able to do dangerous works such as building our buildings, skyscrapers and bridges. About health, doctor robots and nurse robots will be able to examine sick people, take cafe of the injured and give them prescriptions. Space robots will be able to make surveys or inspect on other planets in order to know how they are.