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英语中的动词有五种基本形式 ： 原形 (do, write, think) es 单数第三人称形式 (do, write, think) to 不定式 ( do, write, think) *'to' 有些情况下可省略 ing 现在分词 (do, writ, think) en, thought 过去分词 (done, writt) 现在完成时的动词构成：助动词(have/has) + 动词过去分词形式（5), 比如： have done a) I it many times. has written b) She three books. Have c) you about it carefully? 所有的动词都可以有现在完成时。 那什么时候需要用现在完成时？ 就是当你想要表达到说话时为止，某个动作已经完成，并且你想强调这个动作对现在的影响。结合上面的例子说明： have done a) “I it many times.” 隐含的意思可能是 [So, I know how to do it. You don't need to teach me how to do it.] has written b) "She three books." 隐含的意思可能是 [She is great! She is working on another book now.] Have c) " you about it carefully?" 隐含的意思可能是 [If you haven't, then you probably should because this is an important matter.] 一般过去时 如果纯粹想说到说话时为止，某个动作已经完成，不强调和现在的联系，就可以用。比如： did e) I it. wrote f) She three books. Did g) you about it carefully? (责任编辑：admin) |