| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [be] [vb pp] to | 90 |
|
| 2 | could [not/n't] [be] [verb] to | 90 |
|
| 3 | [modal v] [not/n't] [be] attributed to | 37 |
|
| 4 | could [adv] [be] attributed to | 14 |
|
| 5 | could [not/n't] [be] attributed [prep] | 7 |
|
| 6 | could [not/n't] [be] attribute to | 7 |
|
| 7 | could [not/n't] [be] attributed to | 7 |
|
