| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [to-vb] a | 30301 |
|
| 2 | is [verb] [to-vb] | 16270 |
|
| 3 | is [verb] a | 5666 |
|
| 4 | is [to-vb] a | 1976 |
|
