| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] a [noun] | 4044 |
|
| 2 | [be] [v-ing] [prep] a time | 28 |
|
| 3 | [be] [prep] a time [noun] | 10 |
|
| 4 | [v-ing] [prep] a time [noun] | 10 |
|
