| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [vb pp] [prep] | 18374 |
|
| 2 | is often [vb pp] [prep] | 975 |
|
| 3 | often [adv] [vb pp] [prep] | 192 |
|
| 4 | is often [adv] [vb pp] | 122 |
|
| 5 | is often [adv] [prep] | 18 |
|
