| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] [verb] | 15990 |
|
| 2 | could [be] [vb pp] | 15277 |
|
| 3 | [modal v] [be] taken | 2697 |
|
| 4 | could [be] take | 218 |
|
