| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [be] back [prep] [art] [num ord] | 5 |
|
| 2 | [modal v] [be] back [prep] [art] [num ord] | 5 |
|
| 3 | [be] [verb] back [prep] [art] [num ord] | 26 |
|
| 4 | [be] [vb pp] back [prep] [art] [num ord] | 21 |
|
| 5 | [be] trace back [prep] [art] [num ord] | 8 |
|
| 6 | [be] traced back [prep] [art] [num ord] | 8 |
|
| 7 | [be] back [prep] [art] [num ord] [noun] | 13 |
|
| 8 | [be] back [prep] [art] [num ord] [noun sg] | 12 |
|
