请问present/past perfect tense 跟present/past perf

请问present/past perfect tense 跟present/past perf present perfect tense,past perfect tense 用present perfect tense ,simple past tense , past tense,present tense,past participle present perfect;：indefinite past Simple present tense转换Simple past tense Present perfect tense和 simple past tense 有什麽区别呢 要羡怎麽用呢 例如这题该 帮我造几句present perfect and past tense 的句子 每个tense造5句就行了, Present perfect tense 和 simple past tense 有什麽区别呢 要羡怎麽用呢 例如这题 英语达人请进（有关语法：present perfect tense 和 past tense) past continuous/present continuous/present perfect continuou present continuous tense 跟present perfect continuous tense的混