| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [prep] a | 521 |
|
| 2 | [noun pl] have been [v-ing] [prep] | 456 |
|
| 3 | [noun pl] have been [v-ing] a | 51 |
|
| 4 | [noun pl] have been [prep] a | 36 |
|
