| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this is often [vb pp] | 67 |
|
| 2 | this is often refer | 8 |
|
| 3 | this is often referred | 8 |
|
| 4 | this is often call | 7 |
|
| 5 | this is often called | 7 |
|
| 6 | this is often use | 5 |
|
| 7 | this is often used | 5 |
|
| 8 | this is often see | 5 |
|
| 9 | this is often seen | 5 |
|
