| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] by the [noun sg] | 166 |
|
| 2 | could be [vb pp] by the [noun sg] | 164 |
|
| 3 | [modal v] be explained by the [noun sg] | 42 |
|
| 4 | [vb mod] be explained by the [noun sg] | 42 |
|
| 5 | could be explained [prep] the [noun sg] | 15 |
|
| 6 | could be explained by [art] [noun sg] | 11 |
|
| 7 | could [be] explained by the [noun sg] | 11 |
|
| 8 | could be explained by the [noun sg] | 11 |
|
| 9 | could [be] explained by the [noun sg] | 11 |
|
| 10 | could be explained by the [noun] | 11 |
|
| 11 | could be explain by the [noun sg] | 11 |
|
| 12 | could be explained by the [noun sg] | 11 |
|
