| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which helps [to-vb] | 84 |
|
| 2 | which helps [vb infin] | 40 |
|
| 3 | which helps explain | 18 |
|
| 4 | which helps to explain | 15 |
|
| 5 | which helps keep | 12 |
|
| 6 | which helps to keep | 7 |
|
| 7 | which helps prevent | 6 |
|
| 8 | which helps keep | 5 |
|
