1 分不清vegetable 是单数还是复数 其实 vegetable是可数名词， 而非不可数名词如：They grew their own vegetables (NOT 不说 their own vegetable). 他们自己种菜 。

　　2 分不清fruit是单数还是复数，其实fruit很少用作复数如：fresh fruit and vegetables 新鲜果蔬(除非你强调种类。如:I ate three different fruits this morning)

　　3 分不清furniture是单数还是复数，其实furniture是家具的总称，是不可数的如：What style of furniture do you like?你喜欢什么式样的家具?。He sold the house together with the furniture. 他把房子连同家具一起出售。

　　4 There have a lot of books. ×应该是There are a lot of books.或者She has a lot of books.

　　5 stuff 后面加复数 ×I'd like some coffee, and I don't object to the powdered stuff if it's all you've got. 我想要点咖啡，如果你们只有粉状的东西，我也不反对。