| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it is [adv] difficult [verb] | 43 |
|
| 2 | and it is [adv] difficult [verb] | 35 |
|
| 3 | [conj] it is often difficult [verb] | 22 |
|
| 4 | and it is often [adj] [verb] | 19 |
|
| 5 | and it is often [adj] [verb] | 16 |
|
| 6 | [coord] it is often difficult [verb] | 9 |
|
| 7 | and [pers pn] is often difficult [verb] | 5 |
|
| 8 | and it [is] often difficult [verb] | 5 |
|
| 9 | and it is often difficult [verb] | 5 |
|
| 10 | and it [be] often difficult [verb] | 5 |
|
| 11 | and it is often difficult [verb] | 5 |
|
| 12 | and it is often difficult [verb] | 5 |
|
| 13 | and [pron] is often difficult [verb] | 5 |
|
| 14 | and it be often difficult [verb] | 5 |
|
| 15 | and it is often difficult [verb] | 5 |
|
