| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [vb pp] [prep] [art] | 300 |
|
| 2 | they could [vb infin] [prep] [art] | 191 |
|
| 3 | they could [vb infin] [vb pp] [prep] | 56 |
|
| 4 | they could [vb infin] [vb pp] [art] | 49 |
|
