How to spell is not true?
In our favorite Russian language there are certain rules of writing (spelling). Let's look at how to spell is not true \ wrong under certain conditions.
In a sentence in which there is no opposition to the union “a”, the adverb “wrong” must be written together. In the opposite situation, if there is an opposition, the adverb “not true” should be written separately.
Examples: "The student solved the problem is not true, but with errors." Or: "The student solved the problem incorrectly." Another example: "We composed the text is not true, but with a lot of mistakes." Or: "We did wrong."