there be句型的过去式 — 英语词汇题
题目
用 there be 的过去式完成句子（每空一词）。
1. There ___ (is) a small river near our school last year.
2. There ___ (are) many tall trees on the hill before.
3. 变一般疑问句并作肯定回答：____ ____ a clean lake in our city ten years ago? — Yes, there ___.