PRESENT TENSE

To conjugate a verb in Korean you need to cancel the final part -다. For example, the verb 먹다 (to eat) will become 먹. 

Then you'll need to put -아 or -어 basing on the vocal in the last remained syllable, so you will put -아 after the syllables with the vocals ㅏ and ㅗ, while you will put -어 after the syllables with the vocals ㅓ, ㅜ, ㅣ and ㅡ (so you will put -어 for the verb 먹다).

Eventually, you will have to add the particle "요" to make the verb polite.

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PARTICULAR CASES

1. Verbs ending with 하 transform their ㅏ into ㅐ and just add 요.

2. When a verb ends with ㅐor ㅔ you only need to put 요.

3. If a verb ends with ㅗ, then the conjugation will become ㅘ.

4. If a verb ends with ㅜ, then the conjugation will become ㅝ.

5. If a verb ends with ㅣ, then the conjugation will become ㅕ.

6. If a verb ends with ㅡ, then the conjugation will just be ㅓ.

7. If a verb already ends with ㅏ or ㅓ, you will only need to put 요.