Future perfect continous tense

[abrar08]

Is this sentence correct?

" I will have been playing since 9'o clock"

 

[Barb_D]

Is this sentence correct?

" I will have been playing since 9'o clock"

I have been playing since 9 o'clock. (Note: 9 o'clock not 9'o clock.)
By 8 p.m., I will have been playing for 11 hours.

 

[emsr2d2]

Is this sentence correct?

" I will have been playing since 9'o clock"

It doesn't really work as a sentence on its own.

"I'm going to be very tired by the time I get to your house this evening, as I will have been playing [tennis/football/etc] since 9 o'clock."