现在完成时构成用法

1 现在完成时 句型 基本结构： ①肯定句：主语+have/has+动词的过去分词(p.p)+宾语. ②否定句：主语+have/has+not+动词的过去分词(p.p)+宾语. ③一般疑问句：Have/Has+主语+动词的过去分词(p.p)+宾语. ④特殊疑问句：特殊疑问词或词组+一般疑问句（have/has+主语+过去分词+其他） 定义： （1） 强调动作是过去发生的 （2） 强调对现在的影响或结果 （3） 在过去不确定的时间里发生的动作，但是结果对现在有影响。 过去分词 规则动词：规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。 (1)、一般动词，在词尾直接加“ ed ”。 work---worked---worked ,visit---visited---visited (2)、以“ e ”结尾的动词，只在词尾加“ d ”。 live---lived---lived , (3)、以“辅音字母 + y ”结尾的动词，将 "y" 变为 "i" ，再加“ ed ” study---studied---studied ,cry---cried---cried (4)、重读闭音节结尾，末尾只有一个辅音字母，先双写该辅音字母，再加“ ed ” stop---stopped---stopped , drop---dropped--dropped 不规则动词： A A A 型 原型 过去式 过去分词 burst burst burst cast cast cast cost cost cost cut cut cut hit hit hit hurt hurt hurt put put put set set set shut shut shut spread spread spread let let let read read read read 原形发音为/ri:d/,过去式和过去分词发音为/red/ led led led 2 A B A 型 become became become run ran run come came come A B B 型 bring brought brought buy bought bought build built built burn burnt burnt catch caught caught dig dug dug feel felt felt fight fought fought find found found feed fed fed get got got hang hung hung hear heard heard hold held held keep kept kept lay laid laid lead led led lose lost lost leave left left lend lent lent make made made mean meant meant meet met met pay paid paid sell sold sold shoot shot shot say said said sit sat sat stand stood stood shine shone shone sweep swept swept sleep slept slept teach taught taught tell told told think thought thought win ...