| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | although it [is] often [verb] | 7 |
|
| 2 | although it is often [verb] | 7 |
|
| 3 | although it [is] often [verb] | 7 |
|
| 4 | although it [is] often [vb pp] | 7 |
|
