| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] refer to | 125 |
|
| 2 | have be refer to | 125 |
|
| 3 | have been refer to | 125 |
|
| 4 | have [be] referred to | 110 |
|
| 5 | has [be] refer to | 55 |
|
| 6 | had [be] refer to | 25 |
|
| 7 | have [be] refer to | 21 |
|
| 8 | have [be] refer to | 12 |
|
| 9 | have [be] referring to | 12 |
|
| 10 | having [be] refer to | 5 |
|
