there (is )some milk和There( are )some beef.milk beef都是不可数为什么

there (is )some milk和There( are )some beef.milk beef都是不可数为什么 there is some beef还是there are some beef there is some milk 还是there are some milk there is some beef in the soup还是用 there are some beef in the There is/are some milk and tea . There's some ( )on the table.A.milk B.beef C.tomato D.potato There are some beef .这句话对不对 改错：There is some sweets.There are some milk.There are some p there is some milk为什么要用is there is some milk in the bottle There is some milk in the cup There is some bread and milk.