| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [noun] | 338 |
|
| 2 | must have [noun sg] | 228 |
|
| 3 | must [verb] lifespan | 35 |
|
| 4 | must [vb infin] lifespan | 35 |
|
| 5 | must have lifespan | 34 |
|
| 6 | [vb mod] have lifespan | 34 |
|
| 7 | must have lifespan | 34 |
|
| 8 | [modal v] have lifespan | 34 |
|
| 9 | must have lifespan | 34 |
|
