| Time expression | past perfect | past simple |
|---|---|---|
| After | the exams had finished, | they had a party. |
| When | we'd done the washing-up, | we watched TV. |
| Past simple | time expression | past perfect |
| They had a party | after | the exams had finished. |
| We arrived | before | the train had left (or left). |
| The party couldn't start | until | Kate had arrived. |