I'm afraid that you're fighting an uphill battle. Japanese students have so many bad habits, so deeply ingrained that it is virtually impossible to rectify these short of moving them out of the country.
1) Too many Japanese believe that knowing about English is tantamount to functioning in English.
2) All Japanese students have been taught a large number of falsehoods about English. These stick like s**t to a blanket.
3) Too many Japanese think that they can translate from J to E and people should understand. Some, many??, even think that they can use Japanese word order. This is the product of the terrible grammar translation method used in Japan.
There are other problems but this is a start. So what's a teacher to do.
First, you have to explain to students, this is best done in their own language, that a great deal of the "knowledge" they have on English is not quite accurate.
They have to begin to actually think that the object of their study is to function in the English language. [This is 4)]
I could go on and on but I'll stop here for now. Ganbatte kudasai!