Present SimpleThe dog is in the yard.Is the dog in the yard? Yes,it is.No,it isn't.The dog is not in the yard.Past SimpleThe dog was in the yard.Was the dog in the yard? Yes,it was/No,it wasn't.The dog was not in the yard.Future SimpleThe dog will be in the yard.Will the dog be in the yard? Yes,it will/No,it won't.The dog will not be in the yard.Present SimpleMother is at work.Is mother at work?Yes,she is./No,she isn't.Mother isn't at work.Past SimpleMother was at work.Was mother at work? Yes,she was./No,she wasn't.Mother wasn't at work.Future SimpleMother will be at work.Will mother be at work? Yes,she will./No,she won't.Mother won't be at work.