题目内容：

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

优质解答

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.