The indefinite article a / an is quite tricky; it is easy to say that we place ‘an’ in front of a word that starts with a vowel, like an apple, an electric kettle, an Italian, an option, but when it comes to the vowel u, it is not always clear what to do. The ‘silent h’ also poses problems. Try this exercise and then look at the answers, with an explanation. Hopefully it will make everything clear.
This is a gap-filling exercise about a basic school day.
(You can also watch the video about School Timetables. It’s one of my first, and I wasn’t very smiley at the time, but it’s perfect for learning about how to talk about your own school day.) Good luck with the exercise below!