| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this [noun] [modal v] [verb] | 3925 |
|
| 2 | [adj] system [modal v] [verb] | 325 |
|
| 3 | [det] system [modal v] [verb] | 50 |
|
| 4 | this system [modal v] [verb] | 25 |
|
