| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it become [adv] [adj] | 360 |
|
| 2 | it [verb] [adv] difficult | 83 |
|
| 3 | [pron] become [adv] difficult | 61 |
|
| 4 | [pers pn] become [adv] difficult | 58 |
|
| 5 | it become [adv] difficult | 55 |
|
| 6 | it become [adv] difficult | 55 |
|
