| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun sg] | 407844 |
|
| 2 | be a [noun sg] | 113377 |
|
| 3 | be [prep] [noun sg] | 38184 |
|
| 4 | be [prep] a | 15865 |
|
