Regarding the grammatical structure of the English...

A The English verb system has only two moods: indicative and subjunctive, while the imperative is categorized as a form of command rather than a grammatical mood. B Verb tenses in English, such as the "present perfect" and the "past perfect," indicate aspects related exclusively to chronological time, with no connection to the continuity or sequence of actions.  C In the passive voice, the direct object of the active sentence is often omitted and replaced by an adverb of manner that indicates the agent of the action. D The infinitive in English, as in "to run" or "to sing," cannot be used as the subject of a sentence, being restricted to the function of a verbal complement.  E English uses particles like "will" and "shall" to indicate the future, but the language does not have a formal future tense in its grammar.