| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it can [not/n't] [be] doubted that | 6 |
|
| 2 | [pron] can [not/n't] [be] doubted that | 6 |
|
| 3 | [pers pn] can [not/n't] [be] doubted that | 6 |
|
| 4 | it can [not/n't] [be] doubted that | 6 |
|
