| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [vb pp] to | 2381 |
|
| 2 | is [adv] often [vb pp] | 187 |
|
| 3 | is often [vb pp] to | 171 |
|
| 4 | [adv] often [vb pp] to | 63 |
|
