If I use "a taxi", it would mean that it could be every any taxi drivers driver can delivering me to London.
I meant specifically the driver who is my friend no full stop here so no comma here I used "the" before the "taxi". Is it correct? ly way to say?
If I use the word "a" before the "taxi", who is it would focus on every all the drivers I don't know personally. , everyone who I don't him/her.
No. Saying "the taxi" doesn't mean you use the same taxi (or taxi driver) every day. You can still use "a taxi" even if it's always your friend (a taxi driver) who takes you. To make that situation clear, you need to say "I regularly take a taxi to London. My friend Bob, who is a taxi driver, always takes me".
Please look very carefully at all the corrections I made above. The fact that there are so many errors in just three sentences is what tells us that you are trying to write sentences that are too difficult for your level.
I am locking this thread for now. If I leave it open, I think you're just going to ask more questions when you clearly don't understand the answers you've already been given.