| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been used [prep] many years | 11 |
|
| 2 | have been used [prep] many years | 11 |
|
| 3 | [vb -s] been used [prep] many years | 7 |
|
| 4 | has been used [prep] many years | 7 |
|
| 5 | been used [prep] many years [prep] | 7 |
|
| 6 | been used [prep] many years [prep] | 7 |
|
| 7 | been used [prep] many years in | 5 |
|
| 8 | been used [prep] many years in | 5 |
|
