| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to understand [pron] be going on | 22 |
|
| 2 | to understand what be [v-ing] on | 22 |
|
| 3 | to understand [Wh det] be [v-ing] on | 22 |
|
| 4 | to understand what be [v-ing] on | 22 |
|
| 5 | to understand [pron] is [v-ing] on | 14 |
|
| 6 | to understand [pron] was [v-ing] on | 6 |
|
