The type of errors international students make depends a lot on the structure of their native language. Some Japanese students omit articles entirely. Others try to compensate by including too many. Try to avoid double negation. The resulting interpretation may be the opposite of what you intended.
Double negation is also difficult to understand.
It is better to be direct. Other very common types of errors made by nonnative speakers of English are illustrated in the following table. Correct Form Problems with auxiliary verb sequences, especially involving tense agreement. She should have talk to him. She should have talked to him.