| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [been] [v-ing] for [det] years | 20 |
|
| 2 | [vb past] been [v-ing] for [det] year | 20 |
|
| 3 | had [been] [v-ing] for [det] year | 19 |
|
| 4 | [vb past] [been] [v-ing] for many year | 7 |
|
| 5 | [vb past] [been] [v-ing] for some year | 7 |
|
| 6 | [vb past] [been] [v-ing] for several year | 6 |
|
