| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be used [prep] | 370 |
|
| 2 | [noun sg] could be used | 231 |
|
| 3 | [noun sg] could be [prep] | 226 |
|
| 4 | [noun sg] be used [prep] | 33 |
|
