现在完成时用来表示之前已发生或完成的动作或状态，其结果的确和现在有联系，可表示持续到现在的动作或状态。

句型

基本结构：主语+have/has+过去分词(done)

①肯定句：主语+have/has+过去分词+其他

②否定句：主语+have/has+not+过去分词+其他

③一般疑问句：Have/Has+主语+过去分词+其他

④特殊疑问句：特殊疑问词+一般疑问句(have/has+主语+过去分词+其他)

[编辑本段]过去分词

1 、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。四点变化规则：

(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 ,

play---played---played ,stay---stayed---stayed

(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

2 、不规则动词：

AAA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

AAB型

beat beat beaten

ABA型

become became become

run ran run

come came come

特殊情况

read read read

read原形发音为/ri:d/,过去式和过去分词发音为/red/

ABB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

hear heard heard

hold held held

keep kept kept

lay laid laid

lead led led

lose lost lost

make made made

meet met met

sell sold sold

shoot shot shot

sit sat sat

stand stood stood

sweep swept swept

teach taught taught

tell told told

think thought thought

win won won