| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [noun] [adj] | 12 |
|
| 2 | must have [noun sg] [adj] | 10 |
|
| 3 | [modal v] have lifespan [adj] | 6 |
|
| 4 | must have lifespan [adj] | 6 |
|
| 5 | must [verb] lifespan [adj] | 6 |
|
| 6 | must have lifespan [adj] | 6 |
|
| 7 | must [vb infin] lifespan [adj] | 6 |
|
