Where to use “BY” and “WITH”
Both prepositions tell how the work is done.
But there is a difference
“By” comes before (ing form)
They improved their fluency BY speaking
You can cook a delicious cake, BY adding butter
“By” comes before a noun which is used mainly for communication or transportation
He went to Singapore by plane/by car/by bus/by subway
I got your details by fax /by phone
“WITH” is used when body parts or “TOOLS” are mentioned.
I opened the bottle WITH an opener
He opened the door WITH his hands
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