| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have been [verb] [prep] a | 198 |
|
| 2 | which have been [vb pp] [prep] a | 190 |
|
| 3 | which had been [verb] [prep] a | 86 |
|
| 4 | which has been [verb] [prep] a | 78 |
|
| 5 | which have been [verb] as a | 50 |
|
| 6 | which have been [verb] by a | 37 |
|
| 7 | which have been [verb] [prep] a | 34 |
|
| 8 | which have been [verb] in a | 26 |
|
| 9 | which have been [verb] for a | 14 |
|
| 10 | which have been [verb] to a | 13 |
|
| 11 | which have been [verb] into a | 12 |
|
| 12 | which have been [verb] on a | 12 |
|
| 13 | which have been [verb] from a | 12 |
|
| 14 | which have been [v-ing] [prep] a | 8 |
|
| 15 | which have been [verb] with a | 7 |
|
| 16 | which have been converted [prep] a | 6 |
|
| 17 | which have been used [prep] a | 6 |
|
| 18 | which have been use [prep] a | 6 |
|
| 19 | which have been convert [prep] a | 6 |
|
| 20 | which have been described [prep] a | 5 |
|
| 21 | which have been describe [prep] a | 5 |
|
