One of the most common mistakes that writers make is in the use of homonyms. These words with the same sound yet different in meanings can ruin the quality of your essay, if not used with care. For example, there and their, write and write, then and than, are some common homonyms that can be easily confused. To ensure that you haven't made any mistakes in this domain, it is better to thoroughly read your document. For example, when I write my paper, I check my final document through repeated peer-reviewing. Getting your mistakes fixed in the use of homonyms manually is a more efficient way than using spell-check software.