英语语法：i am out having dinner woth my parents 请问这个having分词短语 左句子的什么成分

英语语法：i am out having dinner woth my parents 请问这个having分词短语 左句子的什么成分 i am having trouble finding out who has taken my book.为什么用finding out i am having a hard i am out是什么意思 I am having a party for i am having breakfast 用现在完成时改写 “I am having a wonderful time here. I am extremely happy having you . At the moment,i am very sad about having to pull out which I know has disappointed you all.形式,这句话我怎么看也看不懂 Mr Zhang,I went to your office ten minutes ago,but you were out.where have you been?--I _a meetingA am having B has had Cwill have Dwas having what's the matter?I am having trouble ( ) who has taken my bookA.looking for B.finding out 我选A,我觉得是正在找,还没有找到 i am having a surprise party for lana on Friday night中为什么是am having? I am find out I am nobody是什么意思 I am having a class.I will call you back. I am out of the office until I am afraid ---(go)out alone i am roasting out here翻译 I am going out of my mind...