| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used [prep] many | 22 |
|
| 2 | have been used [prep] many | 22 |
|
| 3 | have been used for many | 14 |
|
| 4 | have been used for many | 14 |
|
| 5 | has been used [prep] many | 13 |
|
| 6 | had been used [prep] many | 5 |
|
