| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [verb] [verb] [prep] | 457 |
|
| 2 | [verb] [been] [verb] [v-ing] [prep] | 158 |
|
| 3 | have [been] [verb] [v-ing] [prep] | 158 |
|
| 4 | [vb past] [been] [verb] [v-ing] [prep] | 63 |
|
| 5 | had [be] [verb] [v-ing] [prep] | 61 |
|
