| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] have had to | 70 |
|
| 2 | [noun sg] [verb] had to | 70 |
|
| 3 | [noun sg] [vb -s] had to | 45 |
|
| 4 | [noun sg] has had to | 44 |
|
| 5 | [noun sg] had had to | 11 |
|
| 6 | [noun sg] [vb past] had to | 11 |
|
| 7 | [noun sg] have had to | 11 |
|
| 8 | [noun sg] [vb base] had to | 11 |
|
