| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] to distinguish between | 61 |
|
| 2 | it is difficult [verb] between | 9 |
|
| 3 | it is difficult [to-vb] between | 9 |
|
| 4 | it is difficult to distinguish [prep] | 6 |
|
| 5 | it be difficult to distinguish between | 6 |
|
| 6 | it [be] difficult to distinguish between | 6 |
|
| 7 | [pron] is difficult to distinguish between | 5 |
|
| 8 | it is difficult to distinguish between | 5 |
|
| 9 | [pers pn] is difficult to distinguish between | 5 |
|
| 10 | it is difficult distinguish between | 5 |
|
| 11 | it [is] difficult to distinguish between | 5 |
|
