A - An or The?
When should we use A – An or The?
This is probably one of the most common mistakes I hear when speaking with ESL students online. If I had a dollar for every time I have heard this mistake, I would never need to work again.
Basically, the first time you mention something new and unknown into a conversation, you need to use A or An.
After that, every time you mention the item you use The, because it is now understood what we are talking about.
There are exceptions to this rule, but this is the basic idea to get you started.