| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] vary [adv] [v-ing] [prep] | 16 |
|
| 2 | [modal v] vary [adv] [v-ing] [prep] | 16 |
|
| 3 | may [verb] [adv] [v-ing] [prep] | 9 |
|
| 4 | may vary [adv] [v-ing] [prep] | 5 |
|
| 5 | may vary [adv] [v-ing] [prep] | 5 |
|
| 6 | may vary [adv] [verb] [prep] | 5 |
|
| 7 | may vary [adv] [v-ing] [prep] | 5 |
|
