If you are unsure about the correct way to use a word, Google can often solve the problem. Here are 2 examples:
- Yesterday I googled "drink driving" and "drunk driving". Both are correct, but which is more common?
- I wanted to explain the use of "having had", so I googled "having had grammar" and found this page from the BBC.
Google and Wikipedia are two of the best tools for improving your vocabulary and grammar. Try them the next time you have a language problem.