| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] [adv] | 16046 |
|
| 2 | [v-ing] [adv] at | 4390 |
|
| 3 | [was/were] [v-ing] at | 2698 |
|
| 4 | [was/were] [adv] at | 1998 |
|
