| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] to | 892 |
|
| 2 | could be [vb pp] to | 869 |
|
| 3 | [modal v] be attached to | 112 |
|
| 4 | could be attached [prep] | 10 |
|
| 5 | could be attached [prep] | 10 |
|
| 6 | could be attached to | 8 |
|
| 7 | could [be] attached to | 8 |
|
| 8 | could [be] attached to | 8 |
|
| 9 | could be attach to | 8 |
|
| 10 | could be attached to | 8 |
|
