| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [verb] for long periods | 5 |
|
| 2 | [modal v] [be] [verb] for long periods | 5 |
|
| 3 | [modal v] be [verb] for long periods | 5 |
|
| 4 | [modal v] be [verb] for long periods | 5 |
|
| 5 | [modal v] [verb] for long periods [prep] | 6 |
|
| 6 | [modal v] [verb] for long periods [prep] | 6 |
|
