Mastering Past Perfect Continuous: Duration & Cause in English
Learn to use the past perfect continuous tense for duration and cause in English. Clear rules, examples, common mistakes, and practice exercises for B1–B2 learners.
ESL grammar tips
Common Errors with Articles in English – B1 B2 Guide
Stop making mistakes with a, an, and the! Learn the most common article errors B1–B2 learners make and how to fix them. Includes exercises and FAQ.
