I've written down 4 sentences and my thoughts.
High temperatures would melt stones .( imaginary situation in the time of speaking)
High temperatures will melt stones . ( I have no Idea ! - I don't think it suggests a future event )
High temperatures melt stones. ( It is a fact and always happened)
High temperatures can melt stones. ( High temperatures are able to melt stones, certainly )
Are my paraphrases right ?
I am always mixing up the correct usage of would and will in the such contexts. What is the difference between 1 and 2 ?
In Cambridge Advanced Grammar in Use we can read in the unit 16 and on the page 32 that, we can use will/would to talk about things that are or were always true. Thus, I said in sentence 2 that, "I don't think it suggest a future event"