Hi~ you can write it in the present form and the sentence you came up with is correct(but not entirely!) 당신을 웃게 하면 좋겠어요. <- this is fine and natural but using 이거는 in front of that sentence sounds a little awkward. You could replace 이거는 with 이것이 or 이게. In fact, there are many ways to translate this sentence. Also, in Korean the word "it" in "I hope it makes you smile" translates as this/that. (because they way Koreans express that sentence is I hope this makes you smile or I hope that makes you smile- just structural difference in language I think) Thus, you can also replace 이거는 with 그것이 or 그게. These sentences below all mean the same. 이게/이것이 당신을 미소짓게 하기를 바래요. 이게/이것이 당신을 미소짓게 하면 좋겠습니다.. 이게 당신을 웃게만들기를 바래요. Also, you can omit the "it" completely and say: 당신을 미소짓게 하기를.. which is more poetic and literary.