Introduces mixed conditionals ‚Äî constructions that combine elements from different time frames ‚Äî using the example “If I knew, I would have told you”. Distinguishes this from both the standard second and third conditionals, and connects the topic to backshift in reported speech.
Examines the difference between ‘I’m glad you can come’ and ‘I’m glad you could come’, showing how the choice depends on when the conversation takes place. Also addresses the could vs was/were able to rule.