Определить видовременную форму и залог глалолаWe understand that this serious criminal case must be investigated as soon

We understand that this serious criminal case must be investigated as soon as possible. — Understand – Present Simple, active voice. Must be investigated – Present Simple, passive voice.

After the jury had given the verdict, the judge passed the sentence. — had given- Past Perfect, active voice. Passed – past Simple, active voice.

The accused is guaranteed the right to defence. — is guaranteed Present Simple, passive voice.

We use active voice if the doer is important, in active voice subject is the doer of the action.

We use passive voice if the action is important, in passive voice subject takes the action.