After fifteen years of first classes, the pattern is very predictable. These twenty mistakes come from translating Marathi structure directly into English — which is a smart instinct that happens to be wrong.
1. "I am having a car"
Possession does not take the continuous form. Say I have a car.
2. "Yesterday I have gone"
A finished past action with a time word takes simple past: Yesterday I went.
3. "Discuss about"
Discuss already contains "about". Say discuss the plan.
The rest are covered in the Foundation course, with drills so they stop being knowledge and start being habit.