请问present/past perfect tense 跟present/past perf请问present/past perfect tense 跟present/past perfect continuous tense 有何分别?当做时态练习时,如何清楚介定它们.（它们有哪些标示语）

请问present/past perfect tense 跟present/past perf请问present/past perfect tense 跟present/past perfect continuous tense 有何分别?当做时态练习时,如何清楚介定它们.（它们有哪些标示语） 请问什麼是Present Tence,Past Tence,Future Tence,Past Particile呢? 请问verb 跟tense 有什么区别,present tense就是present simple吗比如verb to be 是present tense!verb was 就是 simple past,past tense! present ,past,past participle ,present participresent ,past,past participle ,present participles翻译单词帮帮忙吧 present simple,present continuous ,past simple ,past continuous ,past perfect每个时式作一句句子, past simple present continuous present simple the vervto be' 英语翻译past simple；personal pronoun；present continuous；present simple 请问什么是unreal past conditional 和unreal present conditional?能个给出2个关于睡眠的例子吗? 求 past | past perfect | present perfact 的分别RT 用present perfect tense ,simple past tense , Past participle 和 present participle 怎樣用? A table is made of wood and it is brown and square and it is used to put things on.请问这句话是什么时态?A.simple past (active) B.simple present (passive) C.present perfect D.simple present (active) in the past and present时态in the past and present表示时态是什么 这些present continuous past third person singular这些present continuous past third person singular present perfect tense 是什么 请问present是什么意思, present perfect;：indefinite past有一本英语语法书现在这个单元是 present perfect：indefinite past 请问这是什么语法?我想知道这个单元要讲的是什么意思 因为已经讲过present perfect了,为什么还要加一个i 英语翻译用“in the past”和“at present” 什么时候该用 present perfect 什么时候该用past simple?