there are many cows this year.用last替换this

How many sharks ( ) (be)there in this pool last year?用适当形式提问 There ------pollutions this year than last year. Last year,there 15 students in our team.This year,there are 谚语There are no birds of this year in last year`s nest;Birds 这是一个谚语,there are no birds of this year in last year's nest How many cows are there There ___none. where are you gong this evening?用'last night替换‘this evening’ there were many students in this school last year.(改为否定句） th There were many students in this school last year(改为否定句) There are less car accident this year than there were last y how many cows are there怎么回答 There's_____（little)rain this year than last year.