past simple / past simple

present simple, would have + past participle

present simple, present simple

would + past simple, past simple

if + present simple / will + infinitive

if + will + infinitive, present simple

if + present simple, will + infinitive

if + present simple, past simple

would + infinitive ... if + past simple

if + would + infinitive, past participle

if + will + present simple, past simple

if + past simple, would + infinitive

be / melt

be / melts

is / melt

was / melts

if + present simple, will + infinitive

if + past perfect, would + have + past participle

would + have + past participle ... if + past perfect

none of the previous answersare correct :)