| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [prep] a [noun sg] | 9521 |
|
| 2 | [be] [not/n't] a [noun sg] | 6901 |
|
| 3 | [be] [not/n't] [prep] [noun sg] | 1936 |
|
| 4 | [not/n't] [prep] a [noun sg] | 1292 |
|
| 5 | [be] [not/n't] [prep] a | 573 |
|
