| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] back [prep] the [num ord] century | 40 |
|
| 2 | [vb -s] back [prep] the [adj] century | 40 |
|
| 3 | [verb] back [prep] the 13th century | 7 |
|
| 4 | [vb -s] back [prep] [art] 13th century | 5 |
|
| 5 | [vb -s] back [prep] the 13th century | 5 |
|
| 6 | [vb -s] back [prep] [art] 13th century | 5 |
|
| 7 | [vb -s] [adv prt] [prep] the 13th century | 5 |
|
| 8 | [vb -s] back [prep] the 13th century | 5 |
|
| 9 | [vb -s] back [prep] the 13th century | 5 |
|
| 10 | [vb -s] back [prep] the 13th [noun] | 5 |
|
| 11 | [vb -s] back [prep] the 13th century | 5 |
|
| 12 | [vb -s] [adv] [prep] the 13th century | 5 |
|
