Link: https://www.perfect-english-grammar.com/

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Summary of resource: I have been using this website for over five years now regularly and it’s super useful for students who are practicing grammar, particularly around verb tenses and prepositions. 

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The explanations and exercises are useful in helping understand differences and nuance between common mistakes such as:

• Present Simple or Present Continuous?
• Present Perfect Simple or Continuous?
• Past Simple or Past Continuous?
• Past Perfect or Past Simple?

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Pros:

• Well organised and large variety of grammar topics with thoughtful and realistic exercises
• Free, reliable and easy to use

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Cons/ issues to take into consideration: 

• Exercises are limited- between 2 and 10 exercises per topic generally