it is so difficult for sb to do sth,difficult用so形容对吗?

it is so difficult for sb to do sth,difficult用so形容对吗? The question is so difficult that nobody can answer it The question is so difficult that nobody can answer it SO IT IS DIFFICULT TO TELL THEM FROM EACH OTHER. Why is it so difficult to love someone? It is _question that i can't work it out.A.a so difficult B.so a difficult C.so difficult a 请帮我 it is difficult it is difficult at oh, volleyball is so difficult... why is it so difficult to find a job as even a doorman?why is it so difficult to find a job? the pianist is so popular that it is difficult to get a ticket for his c___. so beautiful is it a a girlsuch a beautiful girl she is 还是such a beautiful girl is she..还有那个so difficult it is such difficult it is so difficult to find a boy on the school.such difficult to find a boy on the school.how difficult it is to so it is often difficult to tell whether they are boys or girls.中的difficult to tell whether是什么 This problem is so difficult that nobody can work it out.It is ___ ___ ___problem_____nobody can work it out. The test was very difficult,so(f )students passed it原因 The question is so difficult that I can't answer it(改为同义句) The question is so difficult that no one can answer it.改为同义句 the question is so difficult that we can't answer it.(同义句)