YOU SAID:

i have seen many of my friends pee in the street

INTO JAPANESE

私は通りで私の友人のおしっこの多くを見てきました

BACK INTO ENGLISH

I've seen a lot of my friend pee in the street

INTO JAPANESE

私は通りで私の友人のおしっこをたくさん見てきました

BACK INTO ENGLISH

I've seen a lot of my friend pee in the street