| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [v-ing] [prep] | 1917 |
|
| 2 | had [been] [v-ing] so | 27 |
|
| 3 | [been] [v-ing] so [prep] | 15 |
|
| 4 | had [been] so [prep] | 11 |
|
