| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] a [noun] | 529 |
|
| 2 | [vb mod] be [vb pp] [prep] a series | 47 |
|
| 3 | [modal v] be [vb pp] [prep] a series | 47 |
|
| 4 | could be [vb pp] [prep] a [n mass] | 20 |
|
| 5 | could be [vb pp] [prep] a series | 6 |
|
| 6 | could [be] [vb pp] [prep] a series | 6 |
|
| 7 | could be [vb pp] [prep] a series | 6 |
|
| 8 | could be [vb pp] [prep] [art] series | 6 |
|
| 9 | could be [vb pp] [prep] a series | 6 |
|
| 10 | could be [vb pp] [prep] [art] series | 6 |
|
| 11 | could [be] [vb pp] [prep] a series | 6 |
|
| 12 | could be [vb pp] [prep] a series | 6 |
|
| 13 | could be [verb] [prep] a series | 6 |
|
| 14 | could be [vb pp] [prep] a series | 6 |
|
