| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it become [adv] difficult | 12 |
|
| 2 | [conj] it become [adv] difficult | 12 |
|
| 3 | [conj] it become difficult [to-vb] | 6 |
|
| 4 | [conj] it become difficult [verb] | 6 |
|
