YOU SAID:

I have a small crush on my friend

INTO JAPANESE

私は私の友人に小さなクラッシュがあります

BACK INTO ENGLISH

I have a small crash on my friend

INTO JAPANESE

友達に小さなクラッシュがあります

BACK INTO ENGLISH

My friend has a small crash

INTO JAPANESE

私の友人は小さなクラッシュを持っています

BACK INTO ENGLISH

My friend has a small crash