| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been build up over the | 8 |
|
| 2 | had been [verb] up over the | 6 |
|
| 3 | have been [vb pp] up over the | 6 |
|
| 4 | have been built up over the | 5 |
|
| 5 | have been [v-ing] up over the | 5 |
|
