| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] to [be] [verb] | 40 |
|
| 2 | could be [vb pp] to be [verb] | 40 |
|
| 3 | could be [vb pp] to [be] [vb pp] | 26 |
|
| 4 | could be said to [be] [verb] | 16 |
|
| 5 | could be [vb pp] to [be] [v-ing] | 14 |
|
| 6 | could be expected to [be] [verb] | 6 |
|
| 7 | could be seen to [be] [verb] | 5 |
|
