Unit8 Have you read Treasure Island yet?Have you heard of these books?Treasure IslandAlice in WonderlandRobinson CrusoeLittle WomenTom SawyerOliver Twist---Have you read Treasure Island yet?---Yes, I have. No, I haven’t.---Have you read Alice in Wonderland yet?---Yes, I have. No, I haven’t.---Have you read Robinson Crusoe yet?---Yes, I have. --I think it’s fantastic.---What do you think of it?---Have you read Robinson Crusoe yet?---Yes, I have.---What do you think of it?--I think it’s fantastic.用法1. 表示过去发生或已经完成的某一动作 对现在造成的影响或结果。 e.g. –Have you had your lunch yet? –Yes, I have. I’ve just had it. (现在 我不饿了。)2. 表示动作或状态从过去某一时刻开始，一直延续到现在，而且可能还要继续下去。现在完成时e.g. I haven’t seen her these days. I’ve known Bob for three years. I’ve been at this school for over two years. 时间状语already, yet, just, ever, never, before构成现在完成时是由“助动词have / has+ 动词的过去分词”构成的，规则动词的过去分词构成与过去式相同，不规则动词的过去分词则需逐个记忆。 动词的过去式的变化和过去分词的变化并不完全相同。我们对它们作了一个大致的分类。 (注：例子中单词的变化顺序为：动词原形 → 动词的过去式? → 动词的过去分词)一、过去式和过去分词的变化相同规则变化：1. 一般在动词词尾直接加ed。如： pick → picked → picked; wish → wished → wished; stay → s |
