나 어떻게 한국어로 " Have you ever~ " 말해요? (How do you say "Have you ever~" in Korean?)
나는 한국어로 " Have you ever~ " 어떻게 알고 싶어. 누군가 나를 도와 줘요?
I want to know how to say "Have you ever~" in Korean. Who can help me?

Examples:
Have you ever wondered why were here?
Have you ever been to Iceland?
Have you ever kissed a frog?

Question

나 어떻게 한국어로 " Have you ever~ " 말해요? (How do you say "Have you ever~" in Korean?)
나는  한국어로 " Have you ever~ " 어떻게 알고 싶어. 누군가 나를 도와 줘요?
I want to know how to say "Have you ever~" in Korean. Who can help me?

Examples:
Have you ever wondered why were here?
Have you ever been to Iceland?
Have you ever kissed a frog?

>

Answer

-본 적 있어? = Have you ever...?

Have you ever wondered why were here? <

Answer

너는 ~ 한/~해 본 적 있어? 
Ex)너는 개구리랑 키스한/키스해 본[봤던] 적 있어? verb + 적; shows experiences in the past
키스하다 + 적 > 키스한 적 or 키스해 본[봤던] 적     
너는 대한민국에 간 적/가 본[봤던] 적 있어? have you ever been to Korea
가다 + 적 > 간 적 or 가본[봤던]
너는 사과를 먹은 적/먹어 본[봤던] 적 있어? have you ever eaten an apple?
먹다 + 적 > 먹은 적/먹어 본[봤던] 
Also you can just say ~해 봤어? > 개구리랑 키스해 봤어? or 거기 가 봤어?