My teaching days are mostly behind me, although a good chunk of my twenties teaching English is China, Ukraine and Saudi Arabia. I have a separate RSS feed for English study guides plus some blog posts about learning English.
When to use should have and must have
Shock: Will Isn't for the Future!
Common Mistakes in English
Using Should Politely
Past and Present Perfect
Yes and No
Modal Verbs of Probability and Inference
Adjectives with -ing and -ed