十三．将来完成时：shall / will have + 过去分词
表示将来某时之前已经完成的动作。
►. They will have been here for 5 years next Friday.
►. By the end of next term, the students will have finished the book.
十三．将来完成时：shall / will have + 过去分词
表示将来某时之前已经完成的动作。
►. They will have been here for 5 years next Friday.
►. By the end of next term, the students will have finished the book.
感叹词是用来表示说话时表达的喜怒哀乐等情感的词。它不构成后面句子的一个语法成分，却在意义上与它...
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六．现在完成进行时： have / has + been + 现在分词 1．表示从过去某时开始发生，一直延续到现在且可...
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