| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] [prep] | 27424 |
|
| 2 | [was/were] because [prep] | 193 |
|
| 3 | [v-ing] because [prep] | 181 |
|
| 4 | [was/were] [v-ing] because | 87 |
|
