Common errors in English grammar are as plentiful as teen girls at a K-Pop concert. Then try the grammar test at the end to check your progress. This is very helpful for various competitive exams like SSC CGL, CHSL, MTS, Stenographer and etc. 50 Common Grammar Mistakes in English. Go through the examples and make sure you understand the corrections. by Rebecca Below are some of the most common English mistakes made by ESL students, in speech and in writing. Actually, maybe even more plentiful.. With schools loosening up on spelling and diction requirements, more people are wandering the content wilderness bereft of the basic knowledge they need to craft impactful content. Dear Readers, In this article we are sharing Common Errors Book PDF Download (English Grammar) 2020. Wrong: I have visited Niagara Falls last weekend.