It is a problem___me?to还是for?

It is a problem___me?to还是for? To do it for him is diffcult对还是 To do it is diffcult for him it is a good place for nightlife还是it is a good place for a n It is beneficial to us to read.还是It is beneficial to us for it is nessary for me to make a plan 这里填of还是for?my studies be It is time for doing还是to do Is it plane ------BeiJin?(填空是to还是for) because it is difficult （）me 填to还是for it is fun to go for a spring outing ___ ___ it is to go for It is well-known to sb 还是It is well-known to for sb? it is a exciting exercise to climbe .这个句子的语法有错误吗?用to 还是for , It is important to/for our study.是to 还是for