French influence in English

Before 1066 AD Britain was invaded by many different nationalities, and many words were taken into the language, however, French had the most influence in English language.
There are words that have similar meaning but different usage.
Case 1:
Commence (French: commencer): It is usually used in official language. ‘The new government food scheme will commence from 1st April 2006.’
‘Begin’ is more general. ‘At what time will you begin your journey tomorrow.’
Case 2:
Demand (French: demande): It has a strong meaning where you are giving the other person little choice. ‘Our Major demands complete obedience.’
‘Ask’ is much gentler: 'He raised his hand because he wanted to ask me a question.'
Case 3:
Finish (French: finis): To come to an end; stop. 'The concert finishes at 8 0'clock.'
‘End’ something lengthy that ends. 'The whole country went crazy when they heard that the war hand ended.’