1) I like you= 널(너를) 좋아해요.

2) I like it= 그걸( 그것을) 좋아해요.

3) I like snow=난(나는) 눈이 좋아해요.

4) I like your eyes= 난 네 눈이 좋아해요.

눈: (snow) and 눈 (eye) are supposed to be distinguished due to their vowel lenght: in the 'snow' it's long, in the 'eye' it's short. and there are planty of similar examples =)

btw, under this link - http://koreanlanguagenotes.blogspot.com/2009/08/why-is-korean-lab-web-site-so-great.html - you can read the following -

One of the interesting things about the Korean language is that its distinugishes many words by the length of the vowel sound. For example, "eye" and "snow" are both written as 눈, but the 눈 for snow is pronounced with a longer vowel sound to distinguish it from eye. If you ask a Korean which word has the longer vowel sound, he or she will probably not be able to tell you or will have to think about it, but when speaking, he or she will probably say it correctly, just out of habit.

One of the reasons that foreigners may not be easily understood when they speak Korean, is that they may have failed to lengthen their vowel sounds, so it is good to learn which words are pronounced with long vowel sounds and which are not. If a Korean friend tells you that you do not need to learn it, ignore him because you will never sound like a Korean until you learn them. A good Korean-Korean dictionary (국어사전) will show you which words are pronounced with a long vowel sound by putting ":" after the syllable (ex. 눈: = snow).

you also might find helpful the following link - http://www.italki.com/question/4369