| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it is often [verb] [adv] | 6 |
|
| 2 | [coord] it is often [verb] [adv] | 5 |
|
| 3 | it is often [adj] [verb] [adv] | 23 |
|
| 4 | it is often [adj] [verb] [adv] | 23 |
|
| 5 | it is often difficult [verb] [adv] | 7 |
|
| 6 | it is often difficult [verb] [adv] | 7 |
|
| 7 | it is often [verb] [conj] [adv] | 5 |
|
| 8 | it is often [verb] [adv] [prep] | 7 |
|
| 9 | it is often [verb] [adv] [prep] | 7 |
|
| 10 | it is often [verb] [adv] [conj] | 6 |
|
| 11 | it is often [verb] [adv] [that] | 6 |
|
| 12 | it is often [verb] [adv] that | 6 |
|
| 13 | it is often [verb] [adv] that | 6 |
|
