| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] [vb pp] for [v-ing] | 15 |
|
| 2 | it [be] [adv] [vb pp] for [v-ing] | 15 |
|
| 3 | it [be] [adv] [vb pp] for [v-ing] | 15 |
|
| 4 | it is [adv] [vb pp] for [v-ing] | 10 |
|
| 5 | it [is] [adv] [vb pp] for [v-ing] | 10 |
|
| 6 | it was [adv] [vb pp] for [v-ing] | 5 |
|
| 7 | it [was/were] [adv] [vb pp] for [v-ing] | 5 |
|
| 8 | it [be] [adv] used for [v-ing] | 5 |
|
