| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [v-ing] [adv] for several | 10 |
|
| 2 | have been [v-ing] [adv] [prep] several | 10 |
|
| 3 | have [been] [v-ing] [adv] [prep] several | 10 |
|
| 4 | have [been] [v-ing] [adv] for several | 10 |
|
| 5 | have [been] [v-ing] [adv] [prep] several | 8 |
|
| 6 | had [been] [v-ing] [adv] [prep] several | 5 |
|
