Grammar 

Elementary

Adele's ESL Corner

This is a website aimed primarily at beginner language learners with simple grammar exercises. The website itself is basic and does not take a long time to load. Learners who are not particularly computer savvy will find it easy to navigate.

eflnet Grammar

This website contains interactive quizzes which provide the learner with instant feedback on errors. The levels are mixed, however elementary students should find the quizzes on adjectives, adverbs, countable and uncountable nouns appropriate.

English Grammar Quizzes - Easy

This site contains an exhaustive list of interactive grammar quizzes aimed at elementary learners of English and includes articles, question formation and verb tenses to name a few.

ESL Partyland - Grammar

Interesting Things for ESL Students - Grammar

There are many interactive quizzes for elementary learners here which help to improve verb formation, preposition use.

Intermediate

The Grammar Aquarium

This is a massive website containing exercises on a variety of grammar structures and tenses. Organised alphabetically, the exercises should be easy for language learners to locate. 

English Exercises Online

A simply designed website which contains some notes on a variety of English grammar structures followed by some interactive exercises containing useful feedback on errors.

Nonstop English - Countable and uncountable nouns

This web page contains a useful exercise that helps students identify common errors associated with countable and uncountable nouns.

Using English - Grammar Quizzes

This site contains a list of grammar quizzes with an option to print out if required.

Interactive ESL Exercises - Grammar

This site contains interactive exercises on areas such as adjectives, determiners, linking words and prepositions.

BBC Skillswise - Grammar

Contains short tutorials and interactive quizzes on grammar structures such as subject-verb agreement, personal pronouns and adverbs. There's also a unit on how to structure a sentence.

English Learner

This site has a list of links to grammar quizzes geared mostly towards intermediate students. There are also links to online tests.

NetGrammar

The site consists of a list of grammar units each containing a short tutorial followed by interactive listening, reading and writing activities. Students can also choose to do extra work by clicking on task units at the bottom of the main page.

ESL Tower - Grammar

This site contains a list of links to interactive grammar quizzes on the left side and a list of printable grammar sheets on the right. Grammar structures are organised alphabetically, making it easy to locate.

English Media Lab - Grammar Quizzes

This site contains interactive grammar quizzes organised into different levels from beginners to advanced learners.