| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] need n't have been | 7 |
|
| 2 | [pron] need n't have been | 7 |
|
| 3 | it need n't have been | 5 |
|
| 4 | it need n't have been | 5 |
|
