1.We are tractor drivers.
2.Those are their/ her children.
1.There is piece of bread and a glass of milk in the table.
There are some pieces of bread and some glasses of milk in the table.
2.An American and an Englishman visited our university yesterday.
Some Americans and Englishmen visited our university yesterday.
3.He is neiter a baby nor a child but a grown -up.
Thwy are neither babies nor children but grown-ups.
不明白的再问哟,请及时采纳,多谢!