| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was at that time [verb] | 12 |
|
| 2 | [was/were] at that time [v-ing] | 8 |
|
| 3 | [was/were] at that time [vb pp] | 8 |
|
| 4 | were at that time [verb] | 6 |
|
