Найти правильную форму глагола в разных типах условных предложений

Is dental caries a disease of the calcified tissues of the teeth caused by the action of micro-organisms on fermentable carbohydrates? Общий

It is characterized by demineralization of the mineral portion of enamel and dentine followed by disintegration of their organic material,isn’t it? Разделительный

Does caries present symptomatically at a relatively early or late stage? Альтернативный

What produces further changes in the periapical tissues? Вопрос к подлежащему

When can the disease be arrested ? Специальный

Is dental caries a disease of the calcified tissues of the teeth caused by the action of micro-organisms on fermentable carbohydrates? Общий

It is characterized by demineralization of the mineral portion of enamel and dentine followed by disintegration of their organic material,isn’t it? Разделительный

Does caries present symptomatically at a relatively early or late stage? Альтернативный

What produces further changes in the periapical tissues? Вопрос к подлежащему

When can the disease be arrested ? Специальный