| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [adj] [to-vb] | 8635 |
|
| 2 | is often [adv] [adj] | 265 |
|
| 3 | is often [adj] [to-vb] | 240 |
|
| 4 | often [adv] [adj] [to-vb] | 109 |
|
