Eighteen units, four pens
Each part of the guide has its own ink color, so you always know where you are. Select any unit to read the explanation, then click Start Practice to test yourself.
ESL Grammar Reference & Practice
Grammar, explained the way a teacher would.
Clear explanations, real examples, and practice for every unit — written from thirty years in the classroom.
Example sentence
She
has been studying
present perfect continuous — Unit 2
academic English
every day
since she entered university
“since” + a starting point (not “for”)
.
Mr. F — your grammar teacher
Thirty years of the same questions — finally answered in one place.
Mr. F has spent over 30 years teaching English in Korea, Taiwan, Saudi Arabia, and Japan, working at companies, colleges, and universities along the way. Over that time, he has noticed that the same grammar questions come up again and again — no matter where in the world his students are from.
This site is his answer: a clear, practical grammar reference built from real classroom experience, with explanations written the way he would explain things to you in person. Every unit includes practice questions so you can test yourself and track your progress as you improve.
Korea
Taiwan
Saudi Arabia
Japan