| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] at a [noun] | 116 |
|
| 2 | [was/were] [v-ing] at a [noun sg] | 106 |
|
| 3 | [was/were] [v-ing] at [art] time | 71 |
|
| 4 | [was/were] [v-ing] at [art] time | 71 |
|
| 5 | [was/were] [verb] at a time | 48 |
|
| 6 | [be] [v-ing] at a time | 13 |
|
| 7 | [was/were] [v-ing] [prep] a time | 10 |
|
| 8 | [was/were] [v-ing] at a time | 6 |
|
| 9 | [was/were] [v-ing] at a time | 6 |
|
