| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] have been possible [prep] [det] | 5 |
|
| 2 | [adv] [vb infin] been possible [prep] [det] | 5 |
|
| 3 | not [verb] been possible [prep] [det] | 5 |
|
| 4 | [not/n't] [verb] been possible [prep] [det] | 5 |
|
| 5 | [adv] have been possible [prep] [det] | 5 |
|
