| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have been [v-ing] for twenty | 5 |
|
| 2 | have been [v-ing] for twenty [noun pl] | 9 |
|
| 3 | have been [v-ing] for twenty [noun] | 9 |
|
| 4 | have been [v-ing] for twenty year | 8 |
|
| 5 | have been [v-ing] for twenty years | 8 |
|
