| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could [adv] happen | 35 |
|
| 2 | it could not happen | 21 |
|
| 3 | it could [not/n't] happen | 21 |
|
| 4 | it could n't happen | 16 |
|
| 5 | it could [adv] happen | 14 |
|
| 6 | it could never happen | 6 |
|
| 7 | it could never happen | 6 |
|
| 8 | it could not happen | 5 |
|
