| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | although it have [adv] been [verb] | 17 |
|
| 2 | although it have [adv] been [vb pp] | 16 |
|
| 3 | although it has [adv] been [verb] | 9 |
|
| 4 | although it had [adv] been [verb] | 7 |
|
