Grammarly
Grammarly Blog: Verb Conjugation Grammar Rules
This page explains verb conjugations including persons: first, second, and third person; number: singular and plural; and tenses: present, past, and future and simple, continuous, and perfect. It provides examples of verb conjugations.
Grammarly
Grammarly Blog: Verb Forms
This page explains the five forms of verbs: root, third-person singular,present participle, past, and past participle and provides examples of each.
Capital Community College Foundation
Guide to Grammar and Writing: Possessive Forms
As you learn possessive forms, you will also learn about gerunds, present participles, compound nouns and more. This is a very complete resource tool for this subject.
English for Everyone
English for Everyone: Sentence Completion 2: Level 2 [Pdf]
English for Everyone provides a printable quiz to assess the application of the present progressive verb tense, a topic covered in Level 2 English. Singular and plural subjects are included in the sentences.