| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] have been [v-ing] for a | 19 |
|
| 2 | [noun prp] had been [verb] for a | 12 |
|
| 3 | [noun prp] has been [verb] for a | 11 |
|
| 4 | [noun prp] have been [vb pp] for a | 8 |
|
