нужно найти в данных предложениях видовременные формы глаголов и указать их

Необходимо найти 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.