Which of the following conditional sentences are grammatically INCORRECT?
1. If Sandhya had started from the hotel on time, she would have not missed the flight.
2. The students wouldn’t have completed their assignment even if the professor would have been there.
3. I had travelled across Europe if I weren’t afraid of airplane crashes.
4. Saurav won’t join music classes unless his father will ask him.
5. Should you wish to join the party, you must let me know by this evening.
6. We would be stupid if we shared our strategy with her.