1, people should be allowed to do legal things. -People should be allowed to do legal things.

Students should be allowed to do some extra reading about science. Students should be allowed to read more books about science.

We should be allowed to make our own choices. -We should be allowed to make our own choices.

Secondly, we should not be allowed to do something to make sentences.

We should not be allowed to smoke in the library.

We shouldn't be allowed to break the rules at school. -We can't break the school rules.

We shouldn't be allowed to talk loudly at the door.

grammatical analysis

1. In the active voice, if allow is not followed by sb, a gerund form is required. If there is sb as the object, it must be followed by something.

2. In the passive voice, only the sentence structure is allowed to do something, but no one is allowed to do something.

3. Grammatically, the main difference between the active voice and the passive voice is that the active voice directly uses the prototype of the verb as the predicate, and then applies tenses and other grammars on the basis of the prototype of the verb, while the passive voice uses the copula+past participle of the verb as the predicate, and various tenses and other grammars are also applied to the copula.