| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be used [prep] some time | 6 |
|
| 2 | [be] used [prep] some time | 6 |
|
| 3 | [been] used [prep] some time | 5 |
|
| 4 | been used [prep] some time | 5 |
|
