100) –은 적이 있다/없다: it is used to express past experiences, and

–은 적이없다 is used to express that there was no experience. –은 적이 있다/없다 can be replaced with 은 일이 있다/없다; it is used after the verb stem that ends in consonants. e.g. 읽은 적이 있다.

100-1) it is used after the verb stem that ends in vowels. e.g. 마신 적이 없다

e.g.
노래 대회에서 상을 받은 적이 있어요(I have received an award from a singing contest before)

초등학교 때 병원에 입원한 적이 있어요(I have been hospitalized when I was in elementary school)

외국에서 길을 잃어버린 적이 있어요? (have you been lost in a foreign country before?)

Q.
1.5년 전에 태권도를 ______(배우다)

2.보쌈을_________(먹다)

3.소맥을__________(마시다)

4.한복을__________(입다)

5.한국에 _________(가다)