| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] on a | 108 |
|
| 2 | had been [verb] on a | 94 |
|
| 3 | had been [vb pp] on a | 91 |
|
| 4 | had been [v-ing] on a | 16 |
|
| 5 | had been [verb] on an | 14 |
|
| 6 | had been work on a | 8 |
|
| 7 | had been working on a | 7 |
|
| 8 | had been put on a | 5 |
|
| 9 | had been built on a | 5 |
|
| 10 | had been place on a | 5 |
|
| 11 | had been placed on a | 5 |
|
| 12 | had been build on a | 5 |
|
