| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [vb pp] [prep] | 102 |
|
| 2 | it is often [verb] [prep] | 102 |
|
| 3 | it is often [verb] as | 22 |
|
| 4 | it is often [verb] by | 20 |
|
| 5 | it is often [verb] to | 20 |
|
| 6 | it is often [verb] in | 17 |
|
| 7 | it is often [verb] with | 11 |
|
| 8 | it is often used [prep] | 8 |
|
| 9 | it is often use [prep] | 8 |
|
| 10 | it is often referred [prep] | 7 |
|
| 11 | it is often refer [prep] | 7 |
|
| 12 | it is often know [prep] | 6 |
|
| 13 | it is often known [prep] | 6 |
|
