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
That didn't even make that much sense in English.