| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] back [prep] | 24756 |
|
| 2 | [v-ing] back [prep] | 3877 |
|
| 3 | thinking [adv] [prep] | 230 |
|
| 4 | think back [prep] | 161 |
|
| 5 | thinking [adv prt] [prep] | 35 |
|
| 6 | thinking back [prep] | 33 |
|
