ing,at the moment,currently,now分别什么时候用?

at the moment 和now的区别 at now等于at the moment 等于at present么 at the moment ; at the present time ; now at once right now right away at the moment 区别、比如用在哪个时态 at the moment , at once,right now,right away区别 just now相当于哪个短语 now . a moment ago . just. at the moment at the moment等于now吗用在什么时态 the moment用在什么时态 for a moment 和for at the moment用什么时态,还有just now 等等等等 at the moment 除了等于right now,还等于什么? now和at the moment用法的问题 请问：目前的英文能用at the moment或 now 看到at the moment用什么时态?