When to 아/어/여 and when to use verb stems. Is there a trick? So while learning many word modifiers and sentence patterns thanks to TTMIK. I noticed one of the biggest things I forget when recalling an ending is if I'm suppose to add the 아/어/여 and conjugate the verb or only use the stem of the verb. I was curious if there was a trick to this or not. I know that when conjugating to the past and present tenses you always add 아/어/여 but I'm asking specifically when you modify the verbs For example. Tell someone to do something : Verb Stem + (으)세요. (Correct) 오세요. (Incorrect) [conjugating the verb stem] 와세요. Ask someone to do something for you: 아/어/여 주세요. (Correct) 해 주세요. (Incorrect) [verb stem] 하 주세요. I hope you understand what I'm trying to ask I know it can be confusing even just to understand a learners question. Is there a trick to this or better to just memorize? thank you!