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