| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which date [adv prt] [prep] the [num ord] | 11 |
|
| 2 | [Wh det] date [adv prt] to the [num ord] | 11 |
|
| 3 | [Wh det] date back [prep] the [num ord] | 11 |
|
| 4 | [Wh det] date [adv prt] to the [num ord] | 11 |
|
| 5 | [Wh det] date [adv prt] [prep] the [num ord] | 11 |
|
| 6 | [Wh det] dates [adv prt] [prep] the [num ord] | 8 |
|
