You should call me when you come back to Korean. (correct) (note: don't use a comma) If you get the bag tomorrow, send me a picture of it. (correct) (note: you should use "a picture" instead of "the picture" - use "the" for specific things, "a" for general. In this case, no picture has been taken yet, so you have to use "a".)

"You should call me, when you come back to Korea" is the correct one.. Although it would be better to say "You should call me when you come back to Korea". The comma is unnecessary as commas indicate a pause in a sentence and in English it would sound unnatural to pause there. It wouldn't make sense to put "will" in that context. You would more likely use that if you were asking a question "Will you come back to Korea?" Again, the first sentence "If you get the bag tomorrow, send me a picture of it" is the better of the two. However it would sound more natural for you to say "Could you send me a picture if you get the bag tomorrow?" or "Could you send me a picture of the bag if you get it tomorrow?" I hope I helped and feel free to ask me to clarify some more if it's still confusing :) Saccara

The first sentence in each pair is correct, the second is wrong. It's a very simple rule: in future tense sentences, the verb following 'when' 'as soon as' 'if' and 'unless' always needs to be a PRESENT tense - either present simple, as in these cases, or present perfect. Just remember that rule.

For the first one : "You should call me when you come back to Korea" (#1 with no ",") for the second one: "If you get the bag tomorrow send me a picture of it" (#1 with no ",")

"Which one is right? 1. You should call me, when you come back to Korea. 2. You should call me, when you WILL come back to korea. Which one is right? 1. If you get the bag tomorrow, send me the picture of it. 2. If you WILL get the bag tomorrow, send me the picture of it." It is confusing, and you've also asked in http://www.italki.com/question/278152: "Fans of Mark are in for a treat this winter, when the acclaimed singer WILL celebrate the release of his fist album in a decade." So the correct forms of these are: a) You should call me when you come back to Korea. b) If you get the bag tomorrow, send me a picture of it. c1) Fans of Mark are in for a treat this winter when the acclaimed singer celebrates the release of his first album in a decade. AND c2) Fans of Mark are in for a treat this winter when the acclaimed singer will celebrate the release of his first album in a decade. Other people have analysed a) and b). c) can be either (which appears to break Su.Ki's rule, but doesn't) because 'Fans of Mark' is not the same subject as 'acclaimed singer'. Thus the clause 'the acclaimed singer ...' and the joining word 'when' don't work the same way as in a). In c) 'when' is a synonym for 'because', whereas in a) 'when' is a conditional. I hope this helps.