| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | thought to have been [verb] [prep] | 86 |
|
| 2 | thought to have been [vb pp] [prep] | 85 |
|
| 3 | [verb] to have been used [prep] | 30 |
|
| 4 | [vb pp] to have been used [prep] | 17 |
|
| 5 | thought [to-vb] been used [prep] | 5 |
|
| 6 | think to have been used [prep] | 5 |
|
| 7 | thought [verb] been used [prep] | 5 |
|
| 8 | thought to have been use [prep] | 5 |
|
| 9 | thought to have [be] used [prep] | 5 |
|
| 10 | thought to have be used [prep] | 5 |
|
| 11 | thought have been used [prep] | 5 |
|
| 12 | thought to have [been] used [prep] | 5 |
|
