| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [noun] | 542 |
|
| 2 | [modal v] [be] [n mass] | 486 |
|
| 3 | [vb mod] [be] [n mass] | 486 |
|
| 4 | could [be] [n mass] | 22 |
|
