| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [adv] difficult for | 9 |
|
| 2 | it have been [adv] difficult for | 9 |
|
| 3 | it have been [adv] difficult for | 9 |
|
| 4 | it have been very difficult for | 6 |
|
| 5 | it have been very difficult for | 6 |
|
| 6 | it 's been [adv] difficult for | 5 |
|
