| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [was/were] a [noun] | 6101 |
|
| 2 | it [was/were] a [noun sg] | 5899 |
|
| 3 | it [be] a mistake | 169 |
|
| 4 | [pron] [was/were] a mistake | 95 |
|
| 5 | it [was/were] [art] mistake | 87 |
|
| 6 | it [was/were] [art] mistake | 87 |
|
| 7 | it [was/were] a mistake | 85 |
|
| 8 | it [was/were] a mistake | 85 |
|
