Simone
简单说来就是 "How long"+"动"+"宾""How long"有两种意思：多长-How long is the Great Wall of China?中国的长城有多长。多久（多长时间）-How long have you been sick?你病念森扮了多长时间了？春冲How long were you hospitalized for?你住院以来多长时间了？用法跟陈述句有关。如果是说中国的长城有多长，陈述句是：The Great Wall of China is xxxx kilometers long.在"How long"的后面加上be动词,再把剩下的句子加上，就是：How long + "be" + "object" =How long is the Great Wall of China.如果是指时间，陈述句是：You have been sick for a week.在"How long"的后面加上动词（或助动词/"be"动词），再加上要问的。如果有助动词，那么助动词在前面，然后是主语，然后是动词+剩下的句子：How long + "be" + "object" =How long "have"（助动词）+ "you"（主语）+ "been"（be动词）+ sick?How long have you been sick?其实用法同其他问仔灶句或倒装句。希望回答了你的求助。
