at the moment 的意思是“現(xiàn)在”“此刻”,常與一般現(xiàn)在時(shí)或現(xiàn)在完成時(shí)連用.例如：
I have got enough to do at the moment.
但是,at the moment 有時(shí)也作“當(dāng)時(shí)”講,用于過去時(shí)態(tài).例如：
I didn't buy that book,because I had no money on me at the moment.
at this (that) moment 的意思是“此時(shí)”、“當(dāng)時(shí)”、“那時(shí)”,可與現(xiàn)在時(shí)、過去時(shí)連用.例如：
Parents may feel sad at this moment.
for a moment 是指“片刻”、“一會(huì)兒”,表示持續(xù)的時(shí)間.例如：
For a moment she just stood there,unable to believe what had just happened.
in a moment 的意思是“很快”、“立即”、“馬上”.例如：
I'll be ready in a moment.
a moment ago,剛才,表示剛才發(fā)生的事情.
I saw Jim a a moment ago.