| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [vb pp] [to-vb] | 1957 |
|
| 2 | is [adv] [vb pp] [adv] | 1372 |
|
| 3 | is [adv] [adv] [to-vb] | 446 |
|
| 4 | [adv] [vb pp] [adv] [to-vb] | 355 |
|
| 5 | is [vb pp] [adv] [to-vb] | 223 |
|
