Day 506 口语主题 Whose 名词复数 are these? 这些是谁的....?

1 Whose books are these?

 这些是谁的书？

2 Whose pens are these?

 这些是谁的钢笔？

3 Whose bikes are these?

 这些是谁的自行车？

4 Whose cars are these?

 这些是谁的汽车？

5 Whose pants are these? 

 这是谁的裤子？