A/an; Used for objects that are not specific, or one of a number.
The; Used for specific object, or objects that both the speaker and listener know.
No article; Used when we talk about non-specific things in plural. For much more follow the list;
10 Sentences of Modals Should, Examples of Should Sentences
45 Sentences of Should, Example Sentences with Modal Should
Modal Verbs Should Sentences, Examples of Should Sentences
10 Sentences of Verbs, Verbs Examples Sentences
Verb Sentences Examples, 90 Verb Example Sentences
95 Negative Sentences Examples, 95 Negative Sentences Examples
