| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] [be] often difficult [to-vb] | 76 |
|
| 2 | [pers pn] be often difficult [verb] | 76 |
|
| 3 | it [be] often difficult [verb] | 72 |
|
| 4 | [pers pn] [is] often difficult [verb] | 62 |
|
| 5 | [pers pn] is often difficult [verb] | 59 |
|
| 6 | [pers pn] was often difficult [verb] | 10 |
|
| 7 | [pers pn] [was/were] often difficult [verb] | 10 |
|
| 8 | [pers pn] [be] often difficult to determine | 5 |
|
| 9 | [pers pn] [be] often difficult determine | 5 |
|
