| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [to-vb] [adv] | 1837 |
|
| 2 | be an [adv] | 1677 |
|
| 3 | be [to-vb] an | 686 |
|
| 4 | [to-vb] an [adv] | 351 |
|
