分类：教育/科学-外语学习-英语考试
问题：英语1.is2.isn't3.are4.aren't5.was6 
1.is  2.isn't  3.are  4.aren't  5.was  6.wasn't  7.were  8.weren't1.There     a  before.(对2.There  any books on the desk before.(错3.There  two pencils in my penci-case now.对4.There  a table in the room before.错5.There  a chair here now.错6.There  any ducks in the p1.is  2.isn't  3.are  4.aren't  5.was  6.wasn't  7.were  8.weren't1.There     a  before.(对2.There  any books on the desk before.(错3.There  two pencils in my penci-case now.对4.There  a table in the room before.错5.There  a chair here now.错6.There  any ducks in the pond.now错7.There  some children on the playground now.对8.There  a desk before.错9.There  many trees in the park before.对10.There  a swing now.对
回答：你要改错？
2. aren't 因为是books 复数
4. wasn't有before是过去时态
5. is 有now表示现在
6. weren't 复数形式且是过去时态
7. are 有now表示现在
8. wasn't 单数且是过去时态