Необходимо определить в данных предложениях видовременные формы глаголов и указать их

Необходимо определить в данных предложениях видовременные формы глаголов и указать их инфинитив: 1)The imposition of indirect taxes will bring about changes in supply. 2)They usually hold they European meeting in Paris. 3)The economic situation in our country changed. 4)In a situation of full employment, the supply of most goods and services will be inelastic. 5)These products usually sell for about five years. 6)Last year the results were not very pleasing.