| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [adj] [verb] | 214 |
|
| 2 | it is often [adj] [verb] | 189 |
|
| 3 | it is [adv] hard [verb] | 136 |
|
| 4 | it is [adv] hard [verb] | 81 |
|
| 5 | it [is] often hard [verb] | 14 |
|
| 6 | it [be] often hard [verb] | 14 |
|
| 7 | it be often hard [verb] | 14 |
|
| 8 | [pron] is often hard [verb] | 13 |
|
| 9 | it is often hard [verb] | 11 |
|
| 10 | it is often hard [verb] | 11 |
|
