| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [vb pp] | 3866 |
|
| 2 | it is usually [vb pp] | 151 |
|
| 3 | is [adv] usually [vb pp] | 45 |
|
| 4 | it is [adv] usually | 11 |
|
