| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [adv] [prep] | 1226 |
|
| 2 | have been [v-ing] [prep] years | 81 |
|
| 3 | been [v-ing] [adv] [prep] years | 43 |
|
| 4 | have been [adv] [prep] years | 28 |
|
