在英语中，当陈述句部分是"There be"结构时，通常使用"be"的适当形式来表示存在或存在的情况。以下是一些常见的"There be"结构及其变体：
1. There is/are - 用于单数或复数名词存在时。
- There is a book on the table.
- There are books on the table.
2. There was/were - 用于过去时态。
- There was a car in the parking lot.
- There were cars in the parking lot.
3. There will be/will be - 用于将来时态。
- There will be a meeting tomorrow.
- There will be meetings tomorrow.
4. There has been/there have been - 用于现在完成时。
- There has been a change in the policy.
- There have been changes in the policy.
5. There seems to be/there appear to be - 用于表示似乎存在的情况。
- There seems to be a problem with the computer.
- There appear to be many options available.
6. There used to be - 用于表示过去曾经存在的情况。
- There used to be a park in this area.
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