since 和now that 当"既然"讲时,有何区别?

since 和now that 当"既然"讲时,有何区别? now that和since作既然讲,有什么区别? because;since;as;for;now that作“因为”讲时,有什么区别? 关于Since that 和Now that的区别 since that 和 now that past 和 past tense 当过去式讲时,有何区别? since then 和since that有什么区别? since 与now that的区别 英语.because和since和due to和as当“因为”讲时应用上的区别?还有yet和but当但是讲时的区别.. seeing (that),now (that),considering (that),表既然的区别 so和such作形容词讲时,有何区别? 副词和名词有何区别讲