| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [be] [v-ing] | 37522 |
|
| 2 | [noun sg] [be] a | 33812 |
|
| 3 | [be] [v-ing] a | 13940 |
|
| 4 | [noun sg] [v-ing] a | 6097 |
|
