The Internet is a valuable resource for students studying English as a second language. Students, teachers and parents can find a number of websites that offer practice activities to perfect English grammar. The type of activities and aids vary by site.

Activities for ESL Students
Activities for ESL students offers bilingual quizzes in dozens of languages from Arabic to Zulu. English-only quizzes are graded as easy, medium and difficult, so students can select more difficult material as they progress. Easy vocabulary quizzes, for example, have pictures to help the student connect the item with its name. Crossword puzzles offer a fun way to apply what you've learned. The teacher section includes quizzes, tips and podcasts.

ESL-grammar.com
ESL-grammar.com includes hundreds of pages of free study material for students and teachers. The lessons are arranged in five categories of skill difficulty. Rules are detailed with examples and audio. For the teacher, the site offers textbook recommendations for each level, materials on the teaching of English grammar, lesson plans and tests.

Grammar Exercises for Learners of English
The Frankfurt International School's Grammar Exercises for Learners of English, has separate sections for students, teachers and parents. Activities include vocabulary, spelling, and punctuation.and grammar. Reading and writing activities help the student become more fluent in English.

Purdue's OWL
Purdue's Online Writing Lab offers activities suitable for both native and second-language English learners. The ESL section of the site includes adult basic education, rules with examples and resources for teachers.