改错【my friends is from nanjing.】

改错【my friends is from nanjing.】
改错【my friends is from nanjing.】

改错【my friends is from nanjing.】
my friends【are】from nanjing.
或者
my 【friend】 is from nanjing.

my friend is from Nanjing

把is 改为are 因为friends是复数

把friends 改成单数形式或者 is 改成are