| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [verb] to | 892 |
|
| 2 | [modal v] be extend to | 137 |
|
| 3 | [vb mod] be extend to | 137 |
|
| 4 | could be extend [prep] | 35 |
|
| 5 | could be extend [prep] | 35 |
|
| 6 | could be extend to | 23 |
|
| 7 | could [be] extend to | 23 |
|
| 8 | could be extend to | 23 |
|
