Question

Mary isn't very intelligent......? using suitable tags

Answer 1

HEYA FOLK

ANSWER IS 

IS SHE  IS QUESTION TAG TO BE ADDED

A QUESTION TAG FOR A STATEMENT WILL BE NEGATIVE IF HELPING VERB IS POSITIVE AND POSITIVE IF HELPING VERB IS NEGATIVE

AS IN QUESTION ,

Mary isn't very intelligent......

HELPING VERB IS NEGATIVE

SO  its question will be positive i.e is she

Answer 2

Hey there! Glad to answer your question.

First let's see the sentence.

Mary isn't very intelligent.

Here, the sentence is negative because of the usage of is not - isn't.

We know that, Positive question tag must be used for negative sentences.

Hence the question tag is Is she?

Mary isn't very intelligent, is she ?