| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [was/were] [prep] [v-ing] | 383 |
|
| 2 | [vb past] it [was/were] [v-ing] | 296 |
|
| 3 | [vb past] it [was/were] [prep] | 269 |
|
| 4 | [vb past] it [prep] [v-ing] | 147 |
|
| 5 | [vb past] [was/were] [prep] [v-ing] | 9 |
|
