(2) Ann says:
If I found a wallet in the street, I'd take it to the police.
This is a different type of situation. Here, Ann is not thinking about a real possibility; she is
imagining the situation and doesn't expect to find a wallet in the street. So she says: If I found..., I'd (=I would)... (
not 'If I find..., I'll...')...
...But it is possible to say 'If... would' when you ask somebody to do something:
(from a formal letter) I would be grateful
if you
would send me your brochure ASAP (
just my contraction 
).
'Shall I close the door?' 'Yes, please,
if you
would.'
So what do you think about all this, guys?