| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [prep] [noun sg] | 978 |
|
| 2 | is [v-ing] [prep] [noun sg] | 912 |
|
| 3 | it is [v-ing] [prep] | 539 |
|
| 4 | it is [v-ing] [noun sg] | 90 |
|
| 5 | it [v-ing] [prep] [noun sg] | 48 |
|
