to lie / to tell a lie

[Present Tense] 

1. Don't lie! [Honorific Polite]
2. Stop lying! [Informal/implolite]
3. It's a lie? Are you lying? [Informal/impolite]
4. Don't joke around. (Stop lying) [Slang]

거짓말해요 

gojinmalhaeyo

Sample Sentence:

1. 거짓말하지 마세요 ! 
2. 거짓말하지 마 ! or 거짓말 마 ! 
3. 거짓말이지? or 거짓말?
4. 뻥치지마. 
   *뻥 is slang term for joke    *Verb: 거짓말하다

so / therefore

1. I like Korean. So I study Korean. [Formal]
2. I am a student. So I have no money. [Informal Polite]
3. Today it rained. Therefore I stayed home. [Informal Polite]

그래서

geuraeseo

Sample Sentence:

1. 나는한국어를 좋아합니다. 그래서 나는 한국어 공부를합니다. 

2. 저는학생이에요. 그래 너돈이없어요.

3. 오늘은비사옸어요. 그래서 집예있었어요. 

busy / to be busy

[Present Tense]

1. I'm really busy these days. [Informal Polite]
2. I'm busy, and I want to sleep.  [Informal Impolite]
3. Are you busy today?  [Informal Polite]

바빠요

bappayo

Sample Sentence:

1. 요즘 정말 바빠요. 
2. 나는 바쁘고, 자고싶어. 
3. 당신 오늘은 바빠요? 
   *Verb: 바쁘다

together

1. Let's go to the movie theater together tomorrow.  [Informal Polite]
2. We belong together.
3. We're destined/fated to be together.
4. Let's learn Korean together!  [Informal Casual]

같이 or  함께

   gachi             hamkke 

Sample Sentence:

1. 내일 같이 영화관에 가요. 
2. 우리는 함께 속한다.  
3. 우린 서로 함께할 운명이란걸요. 
   
4. 한국말을 같이 배우자 !

go/ to go

[Present Tense]

1. Now I'll go where you like. [Informal Casual]
2. Let's go to the park! [Informal Casual]
3. Let's go home. [Informal Casual]
4. I go to school every day. [Informal Polite]
5. I always go to school. [Informal Polite]

거 

ga

Sample Sentence:

1. 이제 네가 원하는데로 가자.
2. 우리 공원가자 ! 
3. 집에 가자. 
4. 저는 날마다 학교에 가요. 
5. 저는 맨날 학교에 가요. 
   *Verb: 거다