Japanese tense and voice are conveyed through changes in the verb form, as in English. What is different is that Japanese has no auxiliary verbs, so, predictably, the formation of the progressive/perfect tenses and questions or negation in the simple tenses cause problems for learners. Japanese verbs do not change for person or number, the most common consequence of which is the omission of the -s in the present simple 3rd person: she go .. / my father work ...