| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] [was/were] a [noun] | 8023 |
|
| 2 | [ex0] [was/were] a [noun sg] | 7845 |
|
| 3 | [pron] [was/were] a period | 67 |
|
| 4 | [ex0] [be] a period | 59 |
|
| 5 | [ex0] [was/were] [art] period | 44 |
|
| 6 | [ex0] [was/were] a period | 44 |
|
| 7 | [ex0] [was/were] a period | 44 |
|
| 8 | [ex0] [was/were] [art] period | 44 |
|
