Conditional Type 4: Unreal Past conditionals a It is impossible that the condition will be fulfilled because it refers to the past Basic form: if-clause main clause past perfect would+ have ppt a e.g. The whether suddenly turned bad yesterday. if we had gone out, we would have been caught in the heavy rain Unreal past的變化: Applying past Perfect Continuous in the If-clause e. g. The driver was driving too fast. If he had been driving slowly, he would have been able to stop in time to avoid the accident Replacing would+have+ppt”with“ Might+have+ppt”表 示可能性 a eg: Ifyou had come earlier you might have seen him◼ Conditional Type 4: Unreal Past conditionals ◼ It is impossible that the condition will be fulfilled because it refers to the past. ◼ Basic form : if-clause main clause ◼ past perfect would + have + ppt ◼ e.g.： The whether suddenly turned bad yesterday. If we had gone out, we would have been caught in the heavy rain. ◼ Unreal Past 的變化： ◼ Applying Past Perfect Continuous in the If-clause ◼ e.g.： The driver was driving too fast. If he had been driving slowly, he would have been able to stop in time to avoid the accident. ◼ Replacing“ Would + have + ppt ” with “ Might + have + ppt ”表 示 可能性 ◼ e.g.： If you had come earlier, you might have seen him