| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it 's [adj] | 1970 |
|
| 2 | [subord] it 's [adj] | 1430 |
|
| 3 | [subord] it be difficult | 197 |
|
| 4 | [subord] it [be] difficult | 197 |
|
| 5 | [subord] it [is] difficult | 164 |
|
| 6 | [conj] it 's difficult | 81 |
|
| 7 | [subord] [pron] 's difficult | 17 |
|
| 8 | [subord] [pers pn] 's difficult | 17 |
|
| 9 | [subord] it 's difficult | 17 |
|
| 10 | [subord] it 's difficult | 17 |
|
