Candidates make a good number of mistakes in the IELTS exams due to their lacking in English Grammar. Studying regularly is important to understand grammatical rules and twists. Here are 10 most common or frequent grammatical mistakes found in different English language exams as well as job exams around the world. Take a look at the usage of singular and plural number, placement of prepositions, use of verbs in tenses, spelling errors, possessives, relative pronoun, double negatives and antecedents. The errors are quite frequent and so corrections are also provided along with the mistakes. I hope this post helps you.