| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] have been [vb pp] at a | 21 |
|
| 2 | [noun pl] have been [verb] at a | 18 |
|
| 3 | [noun pl] have been [v-ing] at a | 9 |
|
| 4 | [noun pl] had been [verb] at a | 8 |
|
