| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [be] traced | 314 |
|
| 2 | [modal v] be traced | 314 |
|
| 3 | can [be] traced | 259 |
|
| 4 | can [be] traced | 259 |
|
| 5 | could [be] traced | 23 |
|
| 6 | could [be] traced | 23 |
|
| 7 | may [be] traced | 20 |
|
| 8 | may [be] traced | 20 |
|
