| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [verb] [adv prt] | 7670 |
|
| 2 | [vb mod] [be] [verb] [adv prt] | 7670 |
|
| 3 | could [be] [verb] [adv] | 1998 |
|
| 4 | could [be] [verb] [adv prt] | 812 |
|
