| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] [verb] to be | 1867 |
|
| 2 | [pron] had to be | 1788 |
|
| 3 | [ex0] [vb past] to be | 579 |
|
| 4 | [ex0] have to be | 461 |
|
| 5 | [ex0] had to [be] | 159 |
|
| 6 | [ex0] had [prep] be | 159 |
|
