| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be three main reasons for | 7 |
|
| 2 | [be] three main reasons for | 7 |
|
| 3 | [am/are] three main reasons for | 6 |
|
| 4 | are three main reasons for | 6 |
|
| 5 | three main reasons for [verb] | 5 |
|
| 6 | three main reasons for [v-ing] | 5 |
|
