Lisa had/will have

[Look down on]

Are these two sentences correct?
a. Lisa had the roof repaired yesterday.
b. Lisa will've the roof repaired tomorrow.

 

[jutfrank]

Sentence a. is correct but sentence b. is missing the main verb had. Can you work out where it should go?

 

[Look down on]

Lisa will have the roof repaired tomorrow.
The contraction will've doesn't work, does it?

 

[GoesStation]

Lisa will have the roof repaired tomorrow.
The contraction will've doesn't work, does it?

No, it doesn't. You can contract have when it's an auxiliary in an affirmative statement, though. Jutfrank had such a sentence in mind in post #2.

 

[jutfrank]

Lisa will have the roof repaired tomorrow.
The contraction will've doesn't work, does it?

Oh, I see. Yes, that's right now.

GoesStation is quite right—the contraction of the two auxiliaries (will and have) made me think that you were trying to make a future perfect sentence, like this:

Lisa will've had the roof repaired tomorrow.

 

[Tdol]

But even if you're aiming at a future causative, then you need will have the roof repaired.