| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] at | 699 |
|
| 2 | had been [v-ing] at | 148 |
|
| 3 | had been sitting [prep] | 56 |
|
| 4 | had been sitting [prep] | 56 |
|
| 5 | have been sitting at | 13 |
|
| 6 | [verb] been sitting at | 13 |
|
| 7 | had [be] sitting at | 10 |
|
| 8 | had been sitting at | 10 |
|
| 9 | had been sit at | 10 |
|
| 10 | had be sitting at | 10 |
|
| 11 | had [been] sitting at | 10 |
|
| 12 | [vb past] been sitting at | 10 |
|
