Eat 먹다 Eating 먹는다 Ate 먹었다 Will eat 먹겠다 To make a sentence, take out the 다 and add 어요. Exception for -ing form, you don't have to take out the 다 and just use the 는다 form. Same thing for another verb, but note that you have to add 어요 when the last sound is ㅓ, ㅣ, ㅜ, ㅡ, ㅐ, ㅔ. You have to add 아요 when the last sound is ㅏ or ㅗ. And you have to change 하다 ---> 해요.