| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is often [vb pp] [to-vb] | 103 |
|
| 2 | is often used [to-vb] | 38 |
|
| 3 | is often use [to-vb] | 38 |
|
| 4 | is often [verb] to have | 9 |
|
| 5 | is often [verb] to describe | 8 |
|
| 6 | is often say [to-vb] | 6 |
|
| 7 | is often said [to-vb] | 6 |
|
| 8 | is often required [to-vb] | 5 |
|
| 9 | is often require [to-vb] | 5 |
|
