now 能和介词at连用吗?at nowMary was singing at this time yesterday.表现现在有的有at presentat this timenow但是这句如果改成Mary was singing at now yesterday似乎就不通顺了的感觉.好像Yesterday和Now是同样性质的,

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now 能和介词at连用吗?at nowMary was singing at this time yesterday.表现现在有的有at presentat this timenow但是这句如果改成Mary was singing at now yesterday似乎就不通顺了的感觉.好像Yesterday和Now是同样性质的,
now 能和介词at连用吗?at now
Mary was singing at this time yesterday.
表现现在有的有
at present
at this time
now
但是这句如果改成Mary was singing at now yesterday似乎就不通顺了的感觉.
好像Yesterday和Now是同样性质的,所以不能重复?但具体要怎么说我讲不清楚

now 能和介词at连用吗?at nowMary was singing at this time yesterday.表现现在有的有at presentat this timenow但是这句如果改成Mary was singing at now yesterday似乎就不通顺了的感觉.好像Yesterday和Now是同样性质的,
不能,"now"确切表示“此时此刻的现在”,绝对不会出现在过去式.而且“now”其实是个副词,但是你会看到“What are you looking at now? “ ”Where are we at now?" ,不过,你知道意思不一样吧,不会感觉稀奇吧.

now 能和介词at连用吗?at nowMary was singing at this time yesterday.表现现在有的有at presentat this timenow但是这句如果改成Mary was singing at now yesterday似乎就不通顺了的感觉.好像Yesterday和Now是同样性质的, 英语短改WE STARTED OFF AT 8.00PM.我想问STARTED OFF 是介词短语.AT是介词.,介词短语和介词能一起连用? 介词能和副词连用吗?If it is necessary,you can call me at anytime.这个句子中的“at”多余吗?为什么?（不要说是语感） about 能和介词连用吗 at once ,right now,right away和now的区别 at once right now at once 和 right now 可以互相转换吗？ right now和at present分别是什么意思? right now 和 at once 的区别? at present、now、recently有什么区别,at present和recently一样吗? They're at working now.和They're at work now.的区别 现在完成时可以和now连用吗比如：He has gotten up now.这句对么? He watched cartoons at home just now.对 at home 部分提问He watched cartoons at home just now.对 at home和just now 部分提问 He is at home now,maybe.这个句子中at home now是状语吗 at present=now?at present=now吗?皆可在句末做时间状语? at the moment & now & at present 是什么? Look At Me Now 歌词 right away=at once=right now?right away和at once都是立刻的意思,而right now不是现在的意思吗?