| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] used for the | 26 |
|
| 2 | [verb] been used for the | 26 |
|
| 3 | have [been] used for the | 26 |
|
| 4 | [vb -s] [been] used for the | 14 |
|
| 5 | has [been] used for the | 14 |
|
| 6 | [vb past] [been] used for the | 5 |
|
| 7 | had [been] used for the | 5 |
|
