| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [verb] | 364 |
|
| 2 | it is often [vb pp] | 362 |
|
| 3 | it is [adv] used | 181 |
|
| 4 | it is [adv] used | 161 |
|
| 5 | [pron] is often used | 32 |
|
| 6 | it be often used | 22 |
|
| 7 | it [be] often used | 22 |
|
| 8 | it is often used | 17 |
|
| 9 | it [is] often used | 17 |
|
| 10 | it is often use | 17 |
|
