Thought I understood a little knowledge about (some) from other threads. Still I have difficulty in understanding on many occasions.
Look at the following :
Do you take some sugar in tea?
Do you take sugar in tea?
What is the difference with the above sentences?
Generally, "Do you take sugar?"
But "Would you like some sugar?"
It's very idiomatic, Gary, so don't worry that it is hard to understand the logic. Sometimes English is not logical.