| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] been [prep] [det] [noun sg] | 10 |
|
| 2 | could [vb infin] [been] [prep] [det] [noun sg] | 10 |
|
| 3 | could have [been] [prep] [det] [noun sg] | 10 |
|
| 4 | could [vb infin] [been] in [det] [noun sg] | 6 |
|
