| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | roof [prep] [pos pn] [noun] | 128 |
|
| 2 | a roof [prep] [pos pn] | 51 |
|
| 3 | a [prep] [pos pn] [noun] | 22 |
|
| 4 | a roof [prep] [noun] | 11 |
|
