| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [be] | 7500 |
|
| 2 | could [adv] [be] | 4063 |
|
| 3 | [vb mod] usually [be] | 417 |
|
| 4 | [modal v] usually [be] | 417 |
|
| 5 | could usually [be] | 8 |
|
| 6 | could usually [be] | 8 |
|
| 7 | could usually [be] | 8 |
|
