| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [modal v] [be] referred to | 8 |
|
| 2 | they [vb mod] [be] refer to | 8 |
|
| 3 | they [modal v] be refer to | 8 |
|
| 4 | they [modal v] [be] refer to | 8 |
|
| 5 | they [modal v] be refer to | 8 |
|
| 6 | they [modal v] [be] refer to | 7 |
|
