| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh det] [modal v] [verb] | 9433 |
|
| 2 | [noun sg] [Wh det] [modal v] [verb] | 5742 |
|
| 3 | system [pron] [modal v] [verb] | 130 |
|
| 4 | system [Wh det] [modal v] [verb] | 106 |
|
