Were there any students on the playground作否定答语

Were there any students on the playground作否定答语 Were there any actors at the apuarium?作否定回答 There are students on the playground.改错 The students were seen ___footabll on the playground just no There is some fish on the plate变为一般疑问句并作否定答语 Were there any students in the classroom yesterday的否定回答 谁帮帮忙Were there any sharks there?作否定回答 There （ ）many students on the playground at the moment. there --- many students on the playground at the moment There are students on the playground这句通顺吗? 1.there are some students----basketball on the playground.(p There are ninty students on the playground.应当如何更正?