| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be often [adj] [to-vb] | 457 |
|
| 2 | be [adv] impossible [to-vb] | 449 |
|
| 3 | be often [adj] [to-vb] | 420 |
|
| 4 | [be] often impossible [to-vb] | 13 |
|
| 5 | be often impossible [to-vb] | 13 |
|
| 6 | be often impossible [verb] | 13 |
|
