| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | although there [verb] be considerable | 5 |
|
| 2 | although there [verb] [been] considerable | 5 |
|
| 3 | although there have [be] considerable | 5 |
|
| 4 | although there [verb] been considerable | 5 |
|
