| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] the main reason [prep] [verb] | 7 |
|
| 2 | be the main reason [prep] [verb] | 7 |
|
| 3 | the main reason [prep] [verb] [adj] | 5 |
|
| 4 | the main reason [prep] [verb] [pron] | 5 |
|
