| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be estimated that | 351 |
|
| 2 | it [is] estimated that | 225 |
|
| 3 | it is estimated that | 208 |
|
| 4 | it was estimated that | 126 |
|
| 5 | it [was/were] estimated that | 126 |
|
| 6 | it 's estimated that | 17 |
|
