Определить видовременные формы глаголов и указать их инфинитив в ниже приведенных предложениях:
1) This student took an active part in the public life of his Institute.
2) The achievements in our science will provide for the progress in our economy.
3) Our machine-builders use the latest technical achievements in their work.
4) The extra-mural students received paid leaves for their exams.