| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduce for the [num ord] time [prep] | 8 |
|
| 2 | introduce for the [num ord] time [prep] | 8 |
|
| 3 | introduce [prep] the first time [prep] | 8 |
|
| 4 | introduce [prep] the [num ord] time [prep] | 8 |
|
| 5 | introduced [prep] the [num ord] time [prep] | 7 |
|
| 6 | introduce [prep] the [num ord] time in | 5 |
|
