+0

Can I use 'as long as / provided (that) / providing (that) / on condition (that) / only if' instead of if in zero conditional?

Thanks

+1

You possibly can in some, but only 'if' is possible in, for example, If you heat ice, it melts. In the traditional zero conditional, 'if' has a similar meaning to 'whenever'. The other expressions have a far stronger idea of exclusive conditionality, 'if and only if'.

You could say 'As you heat ice, it melts', but that is not a conditional sentence.