| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had [been] a [adj] | 303 |
|
| 2 | it [verb] [been] a difficult | 17 |
|
| 3 | it have [been] a difficult | 17 |
|
| 4 | it had [be] a difficult | 6 |
|
| 5 | it had [been] a difficult | 6 |
|
| 6 | [pers pn] had [been] a difficult | 6 |
|
| 7 | it [vb past] [been] a difficult | 6 |
|
| 8 | [pron] had [been] a difficult | 6 |
|
| 9 | it had [been] [art] difficult | 6 |
|
| 10 | it had [been] [art] difficult | 6 |
|
| 11 | it had [been] a difficult | 6 |
|
