Since last week,为什么说last week 是时间点?谁可以帮我解释细点啊?因为我有些分不清时间点?last week上个星期包括好几天啊?怎么是时间点啊

为什么I've been like this since last week不能变成I've liked this since last week Since last week,为什么说last week 是时间点?谁可以帮我解释细点啊?因为我有些分不清时间点?last week上个星期包括好几天啊?怎么是时间点啊 She has moved to her new house since last week.请She has moved to her new house since last week.请问moved前面为什么加has a week ago 和since last week 的区别 —How long have you had the bike?—Since last week什么时态为什么用have和had？ The person whois( in charge) of the foctory has (been )ill since last week为什么用括号里面的答案 过去分词beenHe has been busy since last week为什么不直接用busy的过去分词,而是用been He borrowed the book last week.改用since last week改写快 Mr Green left China last week.Mr Green ____ ___ ___ ___ China since last week. his headache started since last week （改为一般疑问句 ）_____ his headache ____since last week? I haven’t seen her since last week.意思? he has left school since last week改错 He has caught a bad cold since last week改错 How long have you been illA.Since last week B.A week ago C.Once a week 以前学过,忘了,为什么选A呢?我知道选A,但是因为要讲课,相关语法忘了,现在做英语题目都是凭感觉做的,谁能把相关知识点说一下 last week怎样用since回答They borrowed it last weekThey have kept it since 后加什么[两个空｝ They borrowed it last week 变同义句They ____ _____it since last week 横线上填什么词啊 “Because I lost my cat last week.”换一种说法：Because I ___ ___my cat since last week. She has heard from her mother last week.的否定句She( )from her mother since last week.