1) if + had done [past unreal condition], would/could/might (not) + be [present result] 2) if + did [present unreal condition], would/could/might + have + done [past result] 3) on condition that 4) if + did [past condition], will + do/be going to [future result] 5) if + did [past condition], present perfect [past/present result]  6) should [first conditional] 7) provided/providing (that) 8) on condition (that) 9) unless + past participle 10) unless (= if not) 11) unless [as an afterthought] 12) without + noun 13) without + -ing 14) whether or not 15) even if 16) but for 17) if it + not be + for [second/third conditionals] 18) if I were to + do [second conditional] 19) had ... done [third conditionals] 20) were ... to + do [second conditional]

Conditional forms

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