| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [prep] [v-ing] a | 221 |
|
| 2 | it may be [prep] [v-ing] | 62 |
|
| 3 | it may be [prep] a | 16 |
|
| 4 | may be [prep] [v-ing] a | 14 |
|
