| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] what [is] [v-ing] | 951 |
|
| 2 | [verb] [adv prt] what [is] | 236 |
|
| 3 | [adv prt] what [is] [v-ing] | 84 |
|
| 4 | [verb] [adv prt] [is] [v-ing] | 21 |
|
