| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] [pron] at a | 6 |
|
| 2 | be [v-ing] [prep] [pron] at a | 6 |
|
| 3 | [was/were] [v-ing] [prep] [pron] at a | 5 |
|
| 4 | [v-ing] [adv] [prep] [pron] at a | 5 |
|
| 5 | [v-ing] [adv prt] [prep] [pron] at a | 5 |
|
| 6 | [v-ing] [prep] [pron] at a [adj] | 5 |
|
| 7 | [v-ing] [prep] [pron] at a [noun] | 5 |
|
