Определите в них видовременные формы глаголов и укажите их инфинитив

1) Hair is an essential evidence for criminalistics examination.
2) The police broke into the house after the kidnapper.
3) The jury is trying to reach a decision.

1) Hair is (pres simp - to be) an essential evidence for criminalistics examination. 2) The police broke (past simp - to break) into the house after the kidnapper. 3) The jury is trying (pres cont  - to try) to reach (infinitive) a decision.