Is- ginagamit yun kapag isa lang yung noun maliban na lang kung may word na "you"
Are- ginagamit ito kapag marami yung noun, at tsaka ginagamit din ito kapag merong word na "you" sa sentence.
Was-past tense ito ng "is".

Example of is.
She is right.
Is she alright?

Example ng are
You are the one who is hpgoing to be in the grand finals tonight.
They are going to Baguio tomorrow.