| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] [v-ing] [prep] a | 239 |
|
| 2 | [is] [adv] [v-ing] [prep] a | 239 |
|
| 3 | [is] [adv] [v-ing] at [art] | 62 |
|
| 4 | [is] [adv] [v-ing] at [art] | 62 |
|
| 5 | [be] [adv] [v-ing] at a | 47 |
|
| 6 | [is] [adv] [verb] at a | 31 |
|
| 7 | [is] [adv] [v-ing] at a | 11 |
|
| 8 | [is] [adv] [v-ing] at a | 8 |
|
| 9 | [is] [adv] [v-ing] at a | 8 |
|
