before 后接从句还是分词?NCE3 21课有一句：How many unsuccessful attempts did he make before becoming Champion of all England?他经历了多少次尝试后才成为全英国的冠军?before 后接的现在分词作什么成分?宾语?还

before 后接从句还是分词?NCE3 21课有一句：How many unsuccessful attempts did he make before becoming Champion of all England?他经历了多少次尝试后才成为全英国的冠军?before 后接的现在分词作什么成分?宾语?还 若主谓宾 后加从句,怎么知道是定语从句还是分词形式的状语从句? before 用作连词时、后接从句 什么时候+doing 、什么时候+过去分词1.Li Lei often smiles at me before ＿＿＿＿( talk) to me.2.Mr.Smith can buy a small present before ＿＿＿＿（invite） to a party.写出答案、并说明 现在分词作定语的问题请给我几个现在分词作定语,后接宾语从句的句子. She entered the station twenty mintues before the train was due.twenty minutes before 后为何可加从句 before这里是副词还是连词 after before后可直接接句子作宾语从句?那如此类介宾需要that做引导次还是跟that一样可要可不要? remove before wearing. wearing是动名词还是分词? She hesitated for moment before stepping through the doorway,before后为什么是现在分词? You read the product manual before calling the customer service hotline.为什么before后用分词 help,open的过去分词是什么?是before sb do sth.还是before sb doing sth... with a lot assignment -----后接动词原形还是不定式还是动名词形式还是过去分词 NCE3是什么 I smiled at him before walking through the girls' locker room door.before walking through the girls' locker room door中before是介词还是连词?walking through the girls' locker room door是省略了i was的从句还是现在分词短语或者被 方式副词修饰分词,放在分词前还是分词后? i have no idea后到底接的是同位语从句还是宾语从句 1..before后接表示过去某一时间的短语或从句表示发生的动作用过去完成时 2..在before引导的时间状语从句中用一般过去时态代替完成时这两句话矛盾么 OF后接从句? before后面所接从句需不需要遵循“主将从现”原则?另：before从句是否属于时间状语从句?I will finish my homework before you ____ back.A.will come B.come上述例句空格处应选A还是B？