Помогите определить видовременные формы глаголов и указать их инфинитив.1.My friend worked

Помогите определить видовременные формы глаголов и указать их инфинитив.
1.My friend worked at a computer centre.
2.We will go to the library next week.
3.The students are planting trees in the garden.
4.The Institute had already trained many young specialists by 1990.
5.He has visited my village many times.