If I want to say or emphasize that I can do something for hours and days without problem or difficulty what should I say?
I thought about using "forever" but it sounds strange to me.
Like I can play game forever.... sounds strange..
I can play Chess forever. This is OK. I could play Chess forever.
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I can play Chess forever. This is OK.
I could play Chess forever. This is better. It stresses that you are not actually going to play chess forever.
Clive