| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [vb mod] be traced | 66 |
|
| 2 | [noun pl] can be traced | 54 |
|
| 3 | [noun pl] can be traced | 54 |
|
| 4 | [noun pl] may be traced | 6 |
|
| 5 | [noun pl] may be traced | 6 |
|
| 6 | roots [modal v] be traced | 5 |
|
| 7 | problems [modal v] be traced | 5 |
|
