| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [been] [v-ing] [prep] [noun] | 451 |
|
| 2 | [verb] [been] [v-ing] [prep] year | 82 |
|
| 3 | [vb past] [been] [verb] [prep] year | 34 |
|
| 4 | [vb past] [be] [v-ing] [prep] year | 20 |
|
