| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] the [num ord] century | 16 |
|
| 2 | be [v-ing] [prep] the [num ord] century | 16 |
|
| 3 | was [v-ing] [prep] the [num ord] century | 6 |
|
| 4 | be [v-ing] [prep] the nineteenth century | 5 |
|
