1.1 Who were reading a book when I came?
1.2 what were they doing when I came?
1.3 They were reading a book when I came, weren't they?
1.4 were they reading a book or a magazine when I came?
1.5 were they reading a book when I came?
2.1 What she did last week?
2.2 Who sang a nice song last week?
2.3 She sang a nice song last week, didn't she?
2.4 She sang a nice song last week or last month?
2.5 did she sing a nice song last week?
