at once right now right away at the moment 区别、比如用在哪个时态

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  • at once,right now,right away没有本质上区别,都表示现在马上意思.Right now只能用在现在时.比如 Finish it right now!现在就做完它!

    At once 和right away可用在过去时,I did it at once/right away.我当时立马做了某事.

    At the moment表示现在,目前,仅用于现在时.At the moment,we are not clear about what's happening inside the hold up bank.目前我们不知道在被抢的银行中发生些什么.