| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] be [v-ing] [prep] a | 619 |
|
| 2 | [vb infin] be [verb] [prep] a | 584 |
|
| 3 | [vb infin] be [v-ing] [prep] [art] | 125 |
|
| 4 | [vb infin] [be] [v-ing] [prep] a | 34 |
|
| 5 | [vb infin] be [v-ing] [prep] a | 34 |
|
