Определите в следующих предложениях видовременные формы глаголов: 1. the calf receives colostrum, the mammary secretion produced by the cow immediately following parturition.(participle ii? ) 2. though some cows have lived 17 years or more, the average cow is culled or dies between five and six years of age. 3. a deficiency of niacin was one of the causative factors in pellagra. (past simple? ) 4. popular scientists were working there for some period of time. глаголы нашла. не знаю правильно или нет. не могу разобраться с формами

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