| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there have been at | 21 |
|
| 2 | there have [been] at | 21 |
|
| 3 | there have be at | 21 |
|
| 4 | there have [be] at | 8 |
|
| 5 | there has [be] at | 6 |
|
| 6 | there had [be] at | 6 |
|
