The present perfect with 'for' and 'since' Comparatives and superlatives The present perfect with 'just', 'yet' and 'already' Defining relative clauses ‘May’, ‘might’ and ‘could' ‘Used to’ Subject ...

Can you tell me the difference between the past perfect and the present perfect tense? This week Finn and Wang Fei are in the BBC Learning English restaurant, where they are ordering some tasty food ...