| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] a [noun] | 33420 |
|
| 2 | [was/were] a [noun sg] | 32340 |
|
| 3 | [be] a period | 232 |
|
| 4 | [was/were] [art] period | 162 |
|
| 5 | [was/were] [art] period | 162 |
|
| 6 | [was/were] a period | 123 |
|
| 7 | [was/were] a period | 123 |
|
