| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] at [adv] [n mass] | 23 |
|
| 2 | [was/were] [vb pp] at [adv] [noun] | 22 |
|
| 3 | was [verb] at [adv] [noun] | 18 |
|
| 4 | were [verb] at [adv] [noun] | 11 |
|
| 5 | [was/were] [verb] at about [noun] | 9 |
|
| 6 | [was/were] estimate at [adv] [noun] | 8 |
|
| 7 | [was/were] estimated at [adv] [noun] | 8 |
|
| 8 | [was/were] [v-ing] at [adv] [noun] | 6 |
|
| 9 | [was/were] [verb] at [adv] [noun sg] | 5 |
|
