| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [adj] | 2517 |
|
| 2 | is often [vb pp] | 1861 |
|
| 3 | is often [adj] | 901 |
|
| 4 | often [vb pp] [adj] | 246 |
|
