e,g,n are common in German and engish
English and German share a common 'ancestor' in West Germanic.
Luftwaffe
So the RAF could not bomb and strafe German Naval transports bringing soldiers and armour across the English channel for the invasion of Britian.
One of the RAF's successes was to prevent Hitlers airforce the Luftwaffe from gaining air superiority over the English east coast which ultimatly stopped the German plans to invade the UK
No. English and German are like cousins, sharing common ancestry but developing separately.
The German Luftwaffe
Because with the RAF in place the invading German troops would have been destroyed as they attempted to cross the channel and land. The reverse was also true, D Day could not succeed until the Luftwaffe were made ineffective.
The RAF primarily used captured German aircraft for flight testing & evaluation purposes. German aircraft that were severly damaged could not be used.
British = Royal Air Force, RAF German = Luftwaffe
RAF Bases
Like in English it's the "e".