We should respect our teacher, shouldn't we?

It is impossible for the work to be done by me.

The train had left before I reached the station.

A modest person is respected to everyone. 

It should be believed that we actually are not happy without God.

It is uncomfortable to go out in the noon of summer.

Students are to obey the rules and regulations.

He has flawed his eyesight reading small printed letter.

It is our sacred duty to work for the betterment and development of our country.

It is necessary to find out an alternative to oil as fuel.

Besides theoretical education, It is very necessary to acquire practical knowledge.

I shall have done the work before you come.

You have made your application, haven't you?

The true development of a country is possible only by proper using of national resources.

There is no alternative to practicing knowledge for the betterment of the country.