1. His younger brother saw this film a week ago.
Did his younger brother see this film a week ago?
When did his younger brother see this film ?
His younger brother saw this film a week ago, didn't he?
Did his younger brother see this film a week ago or yesterday?
2. There are some new students in our group.
Are there some new students in our group?
How many students are there?
There are some new students in our group, aren't there?
Are there some new students in our group or only two students?
