| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be rarely used | 54 |
|
| 2 | [am/are] rarely used | 21 |
|
| 3 | are rarely used | 21 |
|
| 4 | is rarely used | 19 |
|
| 5 | [is] rarely used | 19 |
|
| 6 | [was/were] rarely used | 10 |
|
| 7 | was rarely used | 10 |
|
