| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [vb pp] a | 1609 |
|
| 2 | [is] usually [vb pp] | 1211 |
|
| 3 | [is] usually a | 318 |
|
| 4 | usually [vb pp] a | 58 |
|
