| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be thought the [noun] | 35 |
|
| 2 | it be thought the [noun sg] | 30 |
|
| 3 | it 's thought the [noun] | 20 |
|
| 4 | it is thought the [noun] | 9 |
|
| 5 | it was thought the [noun] | 6 |
|
