are these two phrases equivalent? 안해도 안돼 해야돼

"exactly" in korean this word can be used in a lot of difference contexts, right? like for example the words i can think of are 정확히, 엄밀히, 딱.. ? when would they be used and why? also if there are any other words you can think of for this purpose let me know, thanks

how would you translate this phrase? i was talking to my friend in korean the other day she said something like 다음주에 한국으로 출발해! i wanted to respond "stop making me feel jealous" but i didn't know how to phrase it in korean. help please? i think i ended up saying 나두가고싶어 which is so ... boring haha. :(

difference between these words as far as i know all these words suggest some sort of possibility.. like using these words implies that nothing is definite. specifically i want to know the difference between these two pairs of words: ㄹ/을 텐데 and ㄹ/을 거 같아요 ㄹ/을 것 같아요 and 보여요 when would you use one instead of the other? also, using 보여요 as a helper verb meaning to seem like soandso would be used like this, right? 피곤해 보인데.. you seem tired? more complicated examples would be helpful thanks!

what's the difference between 질투하다 & 부럽다?

how does the counting system work? i understand counters and stuff, but sometimes i hear things like 한순간 (mostly in songs, if that makes a difference) and things like that, as opposed to 순간 한개 (or whatever the correct counter is) which is what i've learned. it's easy to translate but when speaking korean, how do you decide which to use?

안녕하세요! hello :) 저는 말하기 연습하고싶어요. 스카이프나 msn으로 할까요? 영어도 알아드는거 좋은데 필요없어요. ^^ 메세지 보내주세요. 감사합니다!

how do you say i almost did something? i.e. i almost believed you i almost fell over laughing during the meeting i almost started laughing but thankfully i held back or with nouns: i ate almost all the cookies thanks!

emily's notebook entry: Apr 21, 2010 안녕하세요~ 오랜만이죠ㅋㅋ^^ 좀바빠서 여기서 못썼어요.. 슬퍼요. ㅠ_ㅠ 다음학기엔 한국어수업 못들을거같네요.... 대신에일본어를공부할거예요. 그런데 일본어는 너무너무 어려워요.. 한국어보다 어려워요. 어떡해?!! 나는 왜한국어공부하는지모르지만 일본어공부하는이유도 모르는데요... 공부할 동기부여없다면 잘할수있어? 나한테 잘할수없는데요.. ...아우힘들어요. 그냥 잠들어요....... 근데 일해야돼요. 벌써 밤11시인데 아직 안시작했어요. 인생은 햇가린거예요. ㅠ_______ㅠ