`1` If we had had enough money, we would have gone on holiday

`=>` If + S + had + V-ed/(III), S + would (not) + have + V-ed/(III)

`2` If my husband had left the car keys, we could have picked him up at the station.

`=>` If + S + had + V-ed/(III), S + could (not) + have + V-ed/(III)

`3`If Susan hadn't eaten four cream cakes, she wouldn't have felt sick

`=>` If + S + had + Vpp/V-ed,S  + would/could/might + have + Vpp/V-ed ..

`4`  If John doesn't eat so many chips, he will not be fat.

`=>` If + S + had + Vpp/V-ed,S  + would/could/might + have + Vpp/V-ed ..

`5`  If Jim had lent me some money, I would have been able to buy a car.

`=>`  If + S + had + Vpp/V-ed,S  + would/could/might + have + Vpp/V-ed ..

`6` Unless you tell Bill what to do, he never does anything

`=>` Unless + S + V(s,es) + O, S + will/can/might… + V-inf + O

`7` Unless you keep your feet dry, you will catch a cold

`=>` Unless + S + V(s,es) + O, S + will/can/might… + V-inf + O