| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adv] [prep] a [noun] [prep] | 376 |
|
| 2 | [be] [adv] [prep] a [noun sg] [prep] | 371 |
|
| 3 | [be] [adv] [prep] [art] period [prep] | 9 |
|
| 4 | [be] [adv] [prep] [art] period [prep] | 9 |
|
| 5 | [be] [adv] [prep] a period [prep] | 6 |
|
| 6 | [be] [adv] [prep] a period [prep] | 5 |
|
| 7 | [be] [adv] [prep] a period [prep] | 5 |
|
| 8 | [be] [adv] [prep] a period [prep] | 5 |
|
