| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reason for [v-ing] [det] [noun sg] [is] | 8 |
|
| 2 | reason for [verb] [det] [noun sg] is | 8 |
|
| 3 | reason for [verb] this [noun sg] [is] | 7 |
|
