Here's why:
* Modal verbs are auxiliary verbs that help express things like possibility, permission, obligation, or ability. Examples include: can, could, may, might, will, would, shall, should, must.
* Direct objects are the nouns or pronouns that receive the action of a verb.
* Subject is the noun or pronoun that performs the action of a verb.
Example:
* You may go.
* "May" is the modal verb.
* "You" is the subject.
* "Go" is the verb.
Note: There is no direct object in this sentence.
Let me know if you'd like more examples or have other grammar questions!