| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | are often [verb] [prep] | 786 |
|
| 2 | are often [vb pp] [prep] | 773 |
|
| 3 | are [adv] used [prep] | 396 |
|
| 4 | are [adv] used [prep] | 354 |
|
| 5 | be often used [prep] | 176 |
|
| 6 | [be] often used [prep] | 176 |
|
| 7 | [am/are] often used [prep] | 57 |
|
| 8 | are often used [prep] | 53 |
|
| 9 | are often use [prep] | 53 |
|
| 10 | are often used [prep] | 53 |
|
