| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it become more [adj] | 70 |
|
| 2 | it become more [adj] | 70 |
|
| 3 | it become [adv] difficult | 55 |
|
| 4 | it [verb] more difficult | 18 |
|
| 5 | [pron] become more difficult | 18 |
|
| 6 | [pers pn] become more difficult | 16 |
|
| 7 | it become more difficult | 16 |
|
| 8 | it become more difficult | 16 |
|
