| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] go back | 20 |
|
| 2 | [is] [adj] to go back | 19 |
|
| 3 | is [adj] go back | 14 |
|
| 4 | 's [adj] go back | 7 |
|
| 5 | [is] necessary go back | 6 |
|
| 6 | [is] necessary go back | 6 |
|
