| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [prep] [verb] | 11 |
|
| 2 | it is often [prep] [v-ing] | 11 |
|
| 3 | it is often [prep] [verb] | 11 |
|
| 4 | it is often worth [verb] | 10 |
|
| 5 | it is often worth [verb] | 10 |
|
