Question

Dr. Jenner discovered vaccinate against small pox add a question tag​

Answer 1

Hey Mate,

Dr. Jenner discovered vaccination against small pox, didn't he ?

, didn't he? is the answer.

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Answer 2

Answer:

Dr. Jenner discovered vaccinate against small pox. Didn't he?

Explanation:

When a declarative or an imperative sentence is changed into an interrogative one, it is done by the help of a question tag.