The job is to be done and done quickly!

[Bridget]

Does this sound like a natural sequence?

The job is to be done and done quickly!

How about this one?

The job is to be done and done quickly or I'll have something to say about it!

[Rusty]

Does this sound like a natural sequence?

The job is to be done and done quickly!

How about this one?

The job is to be done and done quickly or I'll have someting to say about it!
Both are natural.

[Bridget]

Thanks, Rusty. And finally, this one?

The job is to be done or I'll see why!

[nila]

hi every one,
this is nilab sultani from afghanistan, i just sign up for this site today and i hope to improve my english by help of you people.
this is my email address nilab.sultani@yahoo.com

[manojq]

Hey guys, the next one is here, I am also new here :cool:

I am from India and crazy about learning English, hope you will be helpful for me ...

Here is my email address : adam_smith@popstar.com.

[Rusty]

Thanks, Rusty. And finally, this one?

The job is to be done or I'll see why!
My first thought is that this is natural. However, the fact that the first clause is formal and the second colloquial makes the sentence unusual.

[Bridget]

My first thought is that this is natural. However, the fact that the first clause is formal and the second colloquial makes the sentence unusual.

And yet mixed-register utterances do appear quite often, don't they?

[Rusty]

And yet mixed-register utterances do appear quite often, don't they?Probably so, but I think it is more likely to hear an active voice.
They'll get the job done quickly or I'll know the reason why!

[Bridget]

Probably so, but I think it is more likely to hear an active voice.
They'll get the job done quickly or I'll know the reason why!

I see. Which would you expect to hear here?

You will do as I say!
You are to do as I say!

[Rusty]

I see. Which would you expect to hear here?

You will do as I say!
You are to do as I say!
A direct order would be "You will do as I say!" In America you would more likely hear "You will do what I say!"
"You are to do as/what I say" sounds like instructions for a future scenario.

[Bridget]

You are to do as/what I say" sounds like instructions for a future scenario.

??

From now on, you are to do as/what I say!
From now on, you will do what I say!

[Rusty]

??

From now on, you are to do as/what I say!
From now on, you will do what I say!
Both are natural. "From now on" would make it a plan, not an instantaneous order, if it were not for the exclamation mark.
From now on, you are to take orders from me.
From now on, you will take orders from Jake.
Both natural.

[Bridget]

It seems to me that both your examples can express a spontaneous order. I can't see what difference the exclamation mark makes.

[Rusty]

It seems to me that both your examples can express a spontaneous order. I can't see what difference the exclamation mark makes.
The exclamation mark makes it emphatic. In spoken language so much depends on tone of voice and facial expression. In writing, as you say, it's sometimes hard to see the difference, if indeed, there is any.