1)if my phone (not/be) so slow ,I could download my photo faster
2)I wish (I/do) math. lessons last year
3)if only I(can) meet my mum at the restaurant next Friday
4)I'd rather you(warn)me about that 3 year ago
в conditional поставить надо,пожалуйста.

1) was not

2) I did

3) could

4) warn