had I seen/ were you to do

[paula carla]

Hi,
Does anyone know the grammar rules to make the more formal conditionals?
and I would like to know if I can apply this rule to the the zero, first , second and third conditionals.
Thanks so much for the help.

[Tdol]

1st - If you becomes Should you
2nd - If you becomes If you were to or were you to
3rd - If you had becomes Had you

[paula carla]

HI,

Very helpful, thank you loads.

[Tdol]

Also, with the first, you'll see 'Should you happen to'. The possibility is reduced in bith the first and second, but not the third.