He's been here for a long time和He's been here a long time的的意思一樣,只是表時(shí)間段的介詞for"長(zhǎng)達(dá)“ 可以省略而已
on that day和 that day 都是指“在那一天”
后者比前者常用,因?yàn)椋?br/>當(dāng)表時(shí)間的詞（day,year,month,week 等） 前面有that,this,next ,last,one,等修飾時(shí)常不用介詞
如：
this week,last month,next year,one day
請(qǐng)?jiān)诳蛻舳擞疑辖窃u(píng)價(jià)點(diǎn)“滿意”即可,лл???????????￡?He's here??He's in here??????