| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] back up the | 102 |
|
| 2 | [vb past] back up the | 49 |
|
| 3 | [v-ing] back up the | 18 |
|
| 4 | [to-vb] back up the | 13 |
|
| 5 | go back up the | 11 |
|
| 6 | climb back up the | 11 |
|
| 7 | look back up the | 10 |
|
| 8 | walk back up the | 10 |
|
| 9 | went back up the | 9 |
|
| 10 | [vb base] back up the | 8 |
|
| 11 | looked back up the | 7 |
|
| 12 | [vb pp] back up the | 7 |
|
| 13 | run back up the | 6 |
|
| 14 | [vb infin] back up the | 5 |
|
| 15 | climbed back up the | 5 |
|
