Substituting Herbs

You are making your recipe and it calls for an herb that you don't have. Can you substitute? Here are a couple of common ones:

Original Herb - Substitution Herb
Basil - Parsley or Cilantro
Chives - Green Onion Tops
Cilantro - Parsley
Dill - Fennel
Marjoram - Oregano (about 1/2)
Oregano - Marjoram (about double)
Parsley - Basil or Chervil
Sage - Thyme or Rosemary
Terragon - Chervil
Thyme - Rosemary or Sage