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By ten o'clock , she will have been typing for three hours

By ten o'clock , she will be typing for three hours

First one is Future Perfect Continues Second is Future Continues

I cant understand the difference between these two

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By ten o'clock , she will have been typing for three hours

At ten o'clock, she will have three hours of typing work behind her.

By ten o'clock , she will be typing for three hours

No correct sentence because Future Continuous tells about what happens exactly at the referenced time in the future. It cannot be used to tell about actions which have started before the referenced time in the future and last until the referenced time.

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  • I agree. For example, you might say "By ten o'clock, she will be typing.", describing an action that may have started before ten o'clock, but will still be going on at ten. Mar 5 '20 at 18:39

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