| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be due to | 288 |
|
| 2 | [modal v] be due to | 288 |
|
| 3 | could be [adj] to | 172 |
|
| 4 | could be [adj] to | 162 |
|
| 5 | could be due [prep] | 47 |
|
| 6 | could be due [prep] | 47 |
|
| 7 | could be due to | 45 |
|
| 8 | could be due to | 45 |
|
| 9 | could be due to | 45 |
|
| 10 | could [be] due to | 45 |
|
