what you had done added to our difficulties.帮忙分析这个句子

what he did has added to out difficulties.这个句子里面OUT是什么意思?还有分 what he did has added to our difficulties为什么用现在完成时 The snowstorm added to our difficulties.为什么要加to,add是及物动词呀 What you have done might do harm to other people.详细分析一下句子结构, Added to our 帮忙分析一下这个句子的成分：A is to B what C is to D . What you had done in this week? 帮忙分析一下这个英语句子的成分：Could you describe what he looks like? What would you have done last night if you hadn't had to stu what would you have done if you had not come to college?why? 英语翻译Success added to our pleasure Successfully added to our 帮忙分析一个句子the supervisor explained what he wanted done这句话的语法结构