| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been used for many | 14 |
|
| 2 | have been used for many | 14 |
|
| 3 | [vb -s] been used for many | 8 |
|
| 4 | has been used for many | 8 |
|
| 5 | [vb past] been used for many | 5 |
|
| 6 | had been used for many | 5 |
|
| 7 | been used for many [noun] | 13 |
|
| 8 | been used for many [noun pl] | 13 |
|
| 9 | been used for many years | 11 |
|
| 10 | been used for many year | 11 |
|
