Grammarly
Grammarly Blog: Verb Tenses: Grammar Rules
This page explains the three major verb tenses: past, present, and future with examples. It also offers links to information about each of these as well as the perfect, continuous, and perfect continuous of each.
English Club
English Club: Learn English: Grammar: Grammar Quizzes: Present Continuous Quiz
Choose the correct verb form to complete each of the ten sentences in this quiz. Feedback is provided after each question.
Other
Eclectic English: The Present Continuous Tense the Ing Form of Verbs
Learn how to correctly add the -ing ending to various types of words, and then practice by adding -ing to twenty-two verbs.
Grammarly
Grammarly Blog: Present Perfect Continuous(present Perfect Progressive)tense
An explanation with examples of present perfect progressive verb tense in sentences.
Other
Tidewater Community College: Writing Center: Verb Tenses
Writing center guide to verb tenses that dicusses present, present continuous, past, past continuous, future, future continuous, present perfect, and past perfect.
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.
English Club
English Club: Learn English: Grammar: Verbs: Future Time
An explanation of future time with links to addition information on present continuous, present simple, future time, and more.
Online Writing Lab at Purdue University
Purdue University Owl: Sequence of Tenses
This Purdue University tutorial covers active and passive voices through simple examples.
English Club
English Club: Basic Tenses: Regular Verbs
Notes and examples of verb tense including past, present, future, past participle, present participle, simple, continuous, perfect, and continuous perfect.
English Club
English Club: Basic Tenses
Notes and examples of verb tense including past, present, future, active, passive, normal, intensive, continuous, perfect, and continuous perfect.
Grammar Tips
Grammar Tips: Problematic Word Pairs: Part I
Certain word pairs present problems for many speakers and writers such as amount versus number, continuous versus continually, and so on. This three-part article identifies problematic word pairs and clarifies their proper use.