| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it become difficult | 12 |
|
| 2 | that it become difficult | 6 |
|
| 3 | [that] it become difficult | 6 |
|
| 4 | [adv] it become difficult | 6 |
|
| 5 | that it become difficult | 6 |
|
| 6 | [adv] it become difficult | 6 |
|
| 7 | [coord] it become difficult | 5 |
|
| 8 | and it become difficult | 5 |
|
| 9 | and it become difficult | 5 |
|
| 10 | it [be] become difficult | 10 |
|
| 11 | it be become difficult | 10 |
|
| 12 | it [verb] become difficult | 5 |
|
| 13 | it was become difficult | 5 |
|
| 14 | it [was/were] become difficult | 5 |
|
| 15 | it [is] become difficult | 5 |
|
| 16 | it become [adv] difficult | 55 |
|
| 17 | it become [adv] difficult | 55 |
|
| 18 | it become increasingly difficult | 21 |
|
| 19 | it become increasingly difficult | 21 |
|
| 20 | it become more difficult | 16 |
|
| 21 | it become more difficult | 16 |
|
| 22 | it become very difficult | 8 |
|
| 23 | it become very difficult | 8 |
|
| 24 | it become difficult [verb] | 24 |
|
| 25 | it become difficult [to-vb] | 24 |
|
