English:I need to hurry or I'll be late for school
Chinese Character:我要行快啲，唔系嘅话就会迟到。

Jyut-ping：ngo5 jiu3 haang4 faai3 di1，m4 hai6 ge3 waa6 zau6 hui2 ci4 dou3

"I need to hurry or I'll be late for school" or

"I should study hard; otherwise I'll fail"

U can say :我要快D啦,唔係就遲大到了.

       OR 我要勤力D讀書,唔係又(唔合格)了(肥佬mean fail in cantonese )

Can u teach me how to say it in KOREAN?

  <em>감사</em>합니다~

How do you say things like that?
For example,
"I need to hurry or I'll be late for school"

我要快d趕返學，如果唔係我就會遲到。

or
"I should study hard; otherwise I'll fail"

我要勤力d讀書，如果唔係就會肥佬。

lee d係地道廣東話口語，希望幫到你...

"I need to hurry = "我要快D啦"

I'll be late for school"= "我就黎返學遲到啦"

"I should study hard; otherwise I'll fail"= "我要比心機溫書啦,如果唔係就會唔合格"

Actually there are many ways to express those meanings in catonese...

just use whatever u think is easy to remember :)

"I need to hurry or I'll be late for school"    嗨呀！！再唔快嘀我就要迟到啦！
"I should study hard; otherwise I'll fail"     我要落力咁去学习！若果唔系我就会唔合格！