| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be think [prep] | 11 |
|
| 2 | must be think [prep] | 11 |
|
| 3 | must [be] think [prep] | 11 |
|
| 4 | must [be] think [prep] | 11 |
|
| 5 | must [be] thought [prep] | 8 |
|
| 6 | must [be] think of | 8 |
|
| 7 | must [be] think of | 8 |
|
