Correct Use of DO / DOES / DID - Basic English Grammar - with Examples, Exercises & Quiz

source: Learn English Lab      2017年11月3日
***** RELATED LESSONS *****
1. HAVE BEEN / HAS BEEN / HAD BEEN: https://www.youtube.com/watch?v=QhSqf...
2. HAVE HAD / HAS HAS / HAD HAD: https://www.youtube.com/watch?v=JYfq0...
3. SHOULD HAVE / COULD HAVE / WOULD HAVE: https://www.youtube.com/watch?v=rk6F7...
4. Correct Use of COULD and WOULD: https://www.youtube.com/watch?v=mU9lY...
5. All GRAMMAR lessons: https://www.youtube.com/playlist?list...
6. All MODAL VERBS lessons: https://www.youtube.com/playlist?list...