| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what you must [verb] is | 15 |
|
| 2 | what you must [verb] is | 15 |
|
| 3 | what you must [vb infin] is | 15 |
|
| 4 | what you must do is | 10 |
|
| 5 | what you must do is | 10 |
|
