I's my grandfather's birthday_Sunday.A.thisI's my grandfather's birthday_Sunday.A.this B.on this C.on

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I''smygrandfather''sbirthday___Sunday.A.thisI''smygrandfather''sbirthday___Sunday.A.thisB.onthisC.onI''sm

I's my grandfather's birthday___Sunday.A.thisI's my grandfather's birthday___Sunday.A.this B.on this C.on
I's my grandfather's birthday___Sunday.A.this
I's my grandfather's birthday___Sunday.
A.this B.on this C.on

I's my grandfather's birthday___Sunday.A.thisI's my grandfather's birthday___Sunday.A.this B.on this C.on
a吧,有this就不用加介词了