| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] [prep] a | 999 |
|
| 2 | is not [v-ing] [prep] | 291 |
|
| 3 | not [v-ing] [prep] a | 210 |
|
| 4 | is not [prep] a | 114 |
|
| 5 | is not [v-ing] a | 46 |
|
