| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] be used for | 11 |
|
| 2 | to have [be] used for | 10 |
|
| 3 | [to-vb] been used for | 10 |
|
| 4 | [to-vb] [been] used for | 10 |
|
