| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | 16 |
|
|
| 2 | but it be difficult [prep] | 16 |
|
| 3 | but it is difficult [prep] | 9 |
|
| 4 | 8 |
|
|
| 5 | 8 |
|
|
| 6 | 5 |
|
|
| 7 | 5 |
|
|
| 8 | but it was difficult [prep] | 5 |
|
