I have finished the essay at last.

I have finished the essay at last. I won't lend you the book before I have finished it.为什么用have finished 请问这句应该是have finished还是finished?The moment I （have） finished I’ll give you a call. I have already finished the work.（变否定句） I have already finished reading the book.句子成分分析, （改一般疑问句）I have already finished the work. Neither he nor I have finished the experiment. neither he nor i have finished the experiment什么意思? have you finished the book?i have read up to --the children discover the secret cave. I have just finished it I ____ the DVD you lent me,but look,I have so many papers to write.A.can have finished B.must have finished C.could have finished D.should have finished Have you finished writing the report?No I have only finished three fifths of it翻译成汉语 Mrs.Lin asked me have you finished drawing the picture?Mrs.Lin asked me-------------I --------------- finished drawing the picture. You shall borrow the book when I have finished reading it为什么要用have finished,这里是有什么语法呢,finished不可以吗 i have finished可否省略have 英语翻译As for me,I am the custodian,and I have not finished my homework either. Have you finished the book ?I'd like to ____ to the library. I -----my work by the time the teacher ----- back.shall have finished,comes 为什么填这个