| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which is [adv] [vb pp] | 1723 |
|
| 2 | is often [adv] [vb pp] | 122 |
|
| 3 | which is often [vb pp] | 94 |
|
| 4 | which is often [adv] | 26 |
|
