at once,immediately,right now,right away
这四个短语常可互换,只是说话角度上有细微区别.
1.at once等于now,without delay.如：
Do it at once.立刻就做.Come here at once!马上就来!
at once 也有“at the same time,together”的意思.如：
Don’t all speak at once!不要全体同时说话!
注意：all at once=suddenly
2.immediately和at once相同,但语意上侧重于“紧接着”.如：
She answered almost immediately.她几乎立刻作了回答.（紧接着问,立刻作答）
He will be ready immediately.他马上就会准备好.（暗指还需几分钟）
注意：immediately还可做连词,等于as soon as.如：
I told him immediately he came.他一来我就告诉他了.
3.right now指at this moment,right away指毫不犹豫或毫不耽误的“立即”.如：
If you get the address,let me know right away.你看到地址,请立即告诉我.
Shall we begin right now?我们现在就开始吗?
for the moment
暂时
for the moment,现在暂时.in a moment,立刻马上.in nature,本质上.on occasion,
现在
at the moment,现在此刻.for a moment,片刻一会儿.for the moment,现在暂时.
目前
for the moment 暂时目前for the present 暂时目前for the sake of 为了为了的利益fo