| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at the same time | 140 |
|
| 2 | [was/were] [v-ing] at the time | 65 |
|
| 3 | [was/were] at the same time | 36 |
|
| 4 | [was/were] [v-ing] at the same | 21 |
|
