| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have been [verb] [prep] a | 198 |
|
| 2 | which have been [vb pp] [prep] a | 190 |
|
| 3 | [pron] have been used [prep] a | 27 |
|
| 4 | which have been used [prep] [art] | 16 |
|
| 5 | which have been used [prep] [art] | 16 |
|
| 6 | which have been use [prep] a | 6 |
|
| 7 | which have been used [prep] a | 6 |
|
| 8 | which have [be] used [prep] a | 6 |
|
| 9 | which have [been] used [prep] a | 6 |
|
| 10 | which have be used [prep] a | 6 |
|
| 11 | which [verb] been used [prep] a | 6 |
|
