| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to have been [vb pp] for | 78 |
|
| 2 | to have been [v-ing] for | 13 |
|
| 3 | to have been used for | 10 |
|
| 4 | to have been use for | 10 |
|
| 5 | to have been design for | 6 |
|
| 6 | to have been designed for | 6 |
|
