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Conditionals
Quick rule
0 = always true. 1 = real future. 2 = unreal present. 3 = unreal past. Mixed = past cause, present result.
If you press this, the whole thing resets.
If the client agrees, we'll start on Monday.
If I were you, I'd ask for it in writing.
If we hadn't booked ahead, we'd have paid double.
Common mistake
✗ If I will see him, I'll tell him. → ✓ If I see him, I'll tell him.
Short practice
If she ___ (ask), I would have helped. → had asked