Grammars for languages


my task is the following:

Σ = {a,b,c} is an alphabet. Find grammars for the following languages over Σ:

∅, {λ}, ∅*, {λ}*, {a,b,c}*, {a,b}+, {a,b,c}, {abc} 

Could someone explain the procedure to me please? Thanks for helping me!