| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to [be] a period [prep] | 10 |
|
| 2 | to [be] a period [prep] [noun] | 5 |
|
| 3 | to [be] a period [prep] [noun sg] | 5 |
|
| 4 | to [be] a period [prep] [adj] | 5 |
|
