Hello Maria, I think your confusion is between the active and passive forms. John is investigating a crime - John is doing the investigating and he is investigating a crime. This is a normal 'subject verb object' sentence (active). We know who is doing what. John is being investigated - someone is investigating John, we don't know who. Now John has changed from being the subject to the object but he is still in subject position. So we use the verb 'be' in the form of the tense you wish to use and the main verb changes to the past participle form. This is the passive form. We often use it where we don't know who did an action or it is not so important. Compare - 'They built the castle in 1640.' and 'The castle was built in 1640.' The second sounds more natural because we don't know who 'they' are. Hope this helps Bob

Only the first sentence sounds correct to me if it is happening in the present . + In order for the second sentence to be correct , I would need to read ++He has been/ will be/ was investigated.

"He is being investigated" is correct and makes sense. It's present tense and indicates he is being investigated at this time. "He is investigated" is incorrect and doesn't make sense. This phrase is wrong and mixes present tense with past tense. "is" = present tense and "investigated" = past tense. It's wrong.... so instead you can say: "He was investigated" ("was" = past tense and "investigated"= past tense) Meaning he was investigated at some point in the past.

Hi Maria, Let's transform these sentences back to active voice. He is being investigated --> (Someone) is investigating him. In this case, the investigation is an ongoing process, and he is focus of someone's investigation. He is investigated --> (Someone) investigates him. The first sentence makes more sense as investigation is a process that takes time. The second sentence sounds unnatural as the investigation takes place regularly again and again. Hope this helps. Cheers, Lance