| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [verb] for [adj] periods | 15 |
|
| 2 | [modal v] [be] [verb] for [adj] periods | 12 |
|
| 3 | [modal v] [be] [verb] for long [noun] | 10 |
|
| 4 | [modal v] [be] [verb] for long periods | 7 |
|
| 5 | [modal v] [be] [verb] [prep] long periods | 5 |
|
| 6 | [modal v] [be] [verb] for long periods | 5 |
|
| 7 | [modal v] [be] [verb] for long period | 5 |
|
| 8 | [modal v] [be] [verb] [prep] long periods | 5 |
|
| 9 | [modal v] [be] [verb] for long [noun pl] | 5 |
|
