（英语小白问题）请教some,any,can,could的使用.

题目

（英语小白问题）请教some,any,can,could的使用.
我文化不高,实在扯不清楚了,又不知道她做的答案是不是对的,只能上来求答案了,再去对照她的本子检查.先谢谢你们了.
选项：some,any,is,are,were,can,couldnot,werenot,wasnot.
1.there____a slide here before.
2.there____some trees before.
3.there____some flowers on the table now.
4.there____any ducks in the park before.
5.we____play basketball now.
6.I____swim before,But I can swim now.
7.there are____new students in our classroom.
8.Are there____trees in the garden?
9.There____a big ball here.
还有不同的声音吗？我刚刚对照了她的作业本，她第一题选的was not,第四题选的were not，

答案

1 wasnot
2 were
3 are
4 werenot
5 can
6 couldnot
7 some
8 any
9 is
楼上的第二题错了,应该是肯定的WERE,如果用了否定were not那么后面的some应该是any了；第五题错了,后面是play 不是playing；