有6题有关for及since用法,帮我看一下好吗?1.She has studies English 【for】three years .2.He has been at the hotel 【since】yesterday .3.She has lived in Brazil 【for】a long time .4.He has taught Italian 【since】last September .5

有6题有关for及since用法,帮我看一下好吗?1.She has studies English 【for】three years .2.He has been at the hotel 【since】yesterday .3.She has lived in Brazil 【for】a long time .4.He has taught Italian 【since】last September .5 while,when,during,since,for的用法及区别做题的时候应该注意什么? since和for用法 清高手帮我解释这个句子,并指出此处since的词性、含义及用法句子为“The report also criticises the canadian goverment for claiming it has since fixed the security lapses.译的好，只是since的位置我还是没理解， for、since、how long 有何共同用法 for和since的用法 since for的具体用法 since与for的用法 since能不能与ago 连用,与for有什么区别.since具体有什么用法? before和since的用法及区别如题. 表原因连词的用法及区别for as since because whilenow that when while since 的区别,及用法 since的基本用法及意思 ever since的用法及时态问题 as ,since,because,for 的用法? since.Been .For现在完成时的用法 since和for的区别用法 英语when,while,since,for的用法?