| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] [prep] a | 971 |
|
| 2 | could [be] [vb pp] [prep] a | 950 |
|
| 3 | [modal v] [be] used [prep] a | 470 |
|
| 4 | [vb mod] [be] used [prep] a | 470 |
|
| 5 | could [be] used [prep] [art] | 139 |
|
| 6 | could [be] used [prep] [art] | 139 |
|
| 7 | could [be] used [prep] a | 88 |
|
| 8 | could [be] use [prep] a | 70 |
|
| 9 | could [be] used [prep] a | 70 |
|
