According to a research, India has the second highest number of English speaking population in the world. It is a second language for a vast majority of people. In a country where many regional languages are used, a lot of errors creep into the grammar and vocabulary of an average English speaker in India.
Writing and speaking in English as a non-native speaker has its own set of problems. Grammatical errors come in many forms and can easily confuse and obscure meaning. Some common errors are with prepositions most importantly, subject verb agreement, tenses, punctuation, spelling and other parts of speech.
Prepositions are tricky, confusing and significant in sentence construction.