| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be used [verb] a [noun] | 219 |
|
| 2 | could be used [verb] [noun] | 74 |
|
| 3 | could be [verb] a [noun] | 72 |
|
| 4 | could be used [verb] a | 17 |
|
