I would never say �There �s much milk �
I would say � Is there much milk? � Yes. There �s plenty. or Yes there �s a full bottle/carton.
No. There �s not much. or Not a lot.
More uses:
Of someone who is sick:
His condition is much improved. (formal)
He is much better. (more casual)
Often used for comparison:
He �s a much better musician than I am.
He practises much more than I do.
You �ve got much more patience than I have.
They have a much bigger house than we do, so we are having the party there .
There are many ways to approach this problem.
He �s tried many different treatments for his skin complaint.
These have a more formal sound than
He �s tried lots of different treatments.