Does it mean my studying may continue more than three hours? No, it doesn't actually mean that. Depending on the situation, you might infer that or you might infer its opposite.
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SadeeBy the time she comes, I'll have been studying for three hours.Does it mean my studying may continue more than three hours?No, it doesn't actually mean that. Depending on the situation, you might infer that or you might infer its opposite. As it stands it only means that you will study for three hours before she arrives. It doesn'
SadeeI will study for three hours before she comesCorrect.
Sadeeand may continue studying.You may continue studying or you may stop studying. Either way you will have been studying for three hours [when / before] she arrives.