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The infinitive in English is a non-finite verb form that is typically marked by the word "to" before the base form of the verb (e.g. to run, to eat, to study). One of the key verbal features of the infinitive is that it does not show tense, person, or number. This means that it can be used in a variety of contexts without needing to be conjugated to match the subject of the sentence.

Another important feature of the infinitive is its versatility in sentence structure. It can be used as the subject of a sentence (e.g. "To travel is my passion"), as the object of a verb (e.g. "I want to learn"), or to express purpose or intention (e.g. "I went to the store to buy some groceries").

Additionally, the infinitive can be used with modal verbs to express possibility, necessity, or permission (e.g. "I must go to the store", "You should study for the exam", "She can speak French").

Overall, the infinitive is a versatile and essential part of English grammar, allowing for a wide range of expressions and functions in both written and spoken language.