| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [vb pp] to [be] | 3854 |
|
| 2 | [is] usually [vb pp] to | 134 |
|
| 3 | usually [vb pp] to [be] | 53 |
|
| 4 | [is] usually to [be] | 11 |
|
