| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reference [vb mod] be made to | 68 |
|
| 2 | reference should be [vb pp] to | 44 |
|
| 3 | reference will be [vb pp] to | 10 |
|
| 4 | reference must be [vb pp] to | 7 |
|
| 5 | reference can be [vb pp] to | 5 |
|
| 6 | reference may be [vb pp] to | 5 |
|
