| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] [prep] | 7289 |
|
| 2 | [modal v] be extend [prep] | 254 |
|
| 3 | could [be] extend [prep] | 35 |
|
| 4 | could be extend [prep] | 35 |
|
| 5 | could [be] extend [prep] | 35 |
|
