| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [been] [v-ing] [adv] for | 51 |
|
| 2 | [vb past] [been] [v-ing] for several | 11 |
|
| 3 | [been] [v-ing] [adv] for several | 8 |
|
