Both sentence pairs make sense. Both describe the same facts. However, in each pair one sentence uses the active voice and one uses the passive voice ... the sentence. For example:‘The exam ...

In English there are two voices: active and passive. The passive voice is the marked voice ... The implication is in the \semantics. In (18), for example, the theme is required, but the agent is ...

Writing in the active voice makes the meaning clear while keeping sentences from becoming complicated and wordy. Sentences using passive voice are not necessarily wrong, just less effective than ...