| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be doing is | 21 |
|
| 2 | [vb mod] [be] doing is | 21 |
|
| 3 | [vb mod] be doing is | 21 |
|
| 4 | should [be] doing is | 11 |
|
