| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | appear to have been [verb] [prep] | 196 |
|
| 2 | appear to have been [vb pp] [prep] | 193 |
|
| 3 | [verb] to have been used [prep] | 30 |
|
| 4 | appear [verb] been used [prep] | 5 |
|
| 5 | appear [to-vb] been used [prep] | 5 |
|
| 6 | appear to have be used [prep] | 5 |
|
| 7 | appear to have been use [prep] | 5 |
|
| 8 | appear have been used [prep] | 5 |
|
| 9 | appear to have [be] used [prep] | 5 |
|
| 10 | appear to have [been] used [prep] | 5 |
|
