| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] a [noun] [adv] | 198 |
|
| 2 | [be] [v-ing] [prep] a [noun sg] [adv] | 197 |
|
| 3 | [be] [verb] [prep] a time [adv] | 68 |
|
| 4 | [be] [v-ing] [prep] [art] time [adv] | 16 |
|
| 5 | [be] [v-ing] [prep] [art] time [adv] | 16 |
|
| 6 | [be] [v-ing] [prep] a time [adv] | 14 |
|
| 7 | [be] [v-ing] [prep] a time [adv] | 14 |
|
