right now和at present分别是什么意思?

right now和at present分别是什么意思? at present与right now的区别谢谢了, at once ,right now,right away和now的区别 .just now right away at present at that moment的区别 right now 和 at once 的区别? right now,at present,译成汉语是什么意思,在句中用什么时态? at present、now、recently有什么区别,at present和recently一样吗? at once right now at the moment & now & at present 是什么? at the present time ,at present ,now的区别` At present 与now 与right now 与 at the moment 有什么区别?或是说搭配在句子的位置有什么区别? at the moment , at once,right now,right away区别用法和意思。 at once 和 right now 可以互相转换吗？ 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? 请问right now和right away都是at once的同义词吗? at now等于at the moment 等于at present么 at once 和right now ,now 词性是不是一样的?如题 at present=now?at present=now吗?皆可在句末做时间状语?