| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] used [verb] | 27 |
|
| 2 | it is [adv] used [verb] | 24 |
|
| 3 | it is often [verb] [verb] | 15 |
|
| 4 | it is often [vb pp] [verb] | 14 |
|
| 5 | [pron] is often used [verb] | 9 |
|
| 6 | it [be] often used [verb] | 7 |
|
| 7 | it be often used [verb] | 7 |
|
| 8 | it is often use [verb] | 6 |
|
| 9 | it is often used [verb] | 6 |
|
| 10 | it [is] often used [verb] | 6 |
|
