| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | he could have [vb pp] [adv] | 95 |
|
| 2 | he could have [vb pp] [adv prt] | 54 |
|
| 3 | [pron] could have [vb pp] back | 20 |
|
| 4 | [pers pn] could have [vb pp] back | 19 |
|
| 5 | he [modal v] have [vb pp] back | 16 |
|
| 6 | he [vb mod] have [vb pp] back | 16 |
|
| 7 | he could have [vb pp] back | 7 |
|
| 8 | he could have [verb] back | 7 |
|
| 9 | he could have [vb pp] back | 7 |
|
| 10 | he could [verb] [vb pp] back | 7 |
|
| 11 | he could have [vb pp] back | 7 |
|
