| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | as it is often [vb pp] | 21 |
|
| 2 | although it is often [vb pp] | 7 |
|
| 3 | [subord] it is often called | 7 |
|
| 4 | [subord] it is often used | 6 |
|
