Can somebody explain me the difference between only and just? In which cases we can use them?
ex: I need just one glass of water, i need only one glass of water
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In practice there would rarely be any significant difference in meaning between OP's two alternatives, but to the extent that they could carry different implications, it's that...
1: I need just one glass of water
All I need is a glass of water (not food, a bed for the night, or anything else significant)
2: I need only one glass of water
I don't need more than one glass of water (one glass is enough)
It's worth noting that #1 above could be used with the same sense as given for #2. The sense I've given for it would more often be expressed as...
3: I just need a/one glass of water