| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it becomes difficult [to-vb] | 5 |
|
| 2 | it becomes [adv] difficult [to-vb] | 18 |
|
| 3 | it becomes [adv] difficult [to-vb] | 18 |
|
| 4 | it becomes very difficult [to-vb] | 6 |
|
| 5 | it becomes very difficult [to-vb] | 6 |
|
| 6 | it becomes increasingly difficult [to-vb] | 5 |
|
| 7 | it becomes increasingly difficult [to-vb] | 5 |
|
