Выпишите из текста глаголы-сказуемые, обусловьте их видовременные формы:By disease in plants

Выпишите из текста глаголы-сказуемые, обусловьте их видовременные формы:By disease in plants is meant some disturbance in the normal life-processes which affects either a particular organ or the entire plant, and which sometimes leads to premature death. Cultivated plants are usually more liable to disease than wild plants. The losses caused by plant diseases are sometimes enormous, and cultivation of certain crops in some countries had been abandoned in the past owing to the ravages of disease.