| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | can [be] [verb] back [prep] | 130 |
|
| 2 | can [be] trace [adv] [prep] | 93 |
|
| 3 | [modal v] [be] trace back [prep] | 91 |
|
| 4 | can [be] trace [adv prt] [prep] | 83 |
|
| 5 | can [be] trace back [prep] | 82 |
|
| 6 | can [be] trace back [prep] | 82 |
|
