有幾個英文問題想問問, 請英文人答答我 plz~~

i should have told u
同 i should tell u
有mud 分別 ??


同埋. ...聽到有外國人講. ..
this is so gay  . . . . ..當然唔係話佢係同性戀. .. .
this is so sexy   . ..  ..當然唔係explain 好性感. .

咁即係點解 ???

please help me ~~thxthx

happy chinese new yr~