Fixed expressions/phrases don't have to follow the normal standard way of grammar? <br/><br/>So they are like idioms and idioms are like that too, right?<br/><br/>Using them in essay writing would not be discouraged or marked down?<br/><br/><b>I was told that in the following cases, the article is missing because they are fixed phrase/expression:<br/></b><br/><br/>A. Go by car (or any transportation)<br/>B. Call into question<br/>C. In progress<br/>D. Under development<br/>