| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to have been used [prep] | 30 |
|
| 2 | [vb pp] to have been used [prep] | 17 |
|
| 3 | [verb] to have been used for | 9 |
|
| 4 | [verb] to have been used for | 9 |
|
| 5 | [verb] to have been used in | 8 |
|
| 6 | [verb] to have been used in | 8 |
|
| 7 | [verb] to have been used by | 8 |
|
| 8 | [verb] to have been used by | 8 |
|
| 9 | [vb -s] to have been used [prep] | 6 |
|
| 10 | think to have been used [prep] | 5 |
|
| 11 | [vb past] to have been used [prep] | 5 |
|
| 12 | appear to have been used [prep] | 5 |
|
| 13 | thought to have been used [prep] | 5 |
|
| 14 | believe to have been used [prep] | 5 |
|
