| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [noun] | 1451 |
|
| 2 | had [been] [noun pl] | 395 |
|
| 3 | [verb] [been] difficulties | 11 |
|
| 4 | have [been] difficulties | 11 |
|
| 5 | had [been] difficulty | 6 |
|
| 6 | [vb past] [been] difficulties | 6 |
|
| 7 | had [be] difficulties | 6 |
|
