Question

shashank will study hard.........? the correct question tag is​

Answer 1

shashank will study hard., won't he.......?

Answer 2

The blank can be filled with ' won't '.

So correct sentence will be:

Shashank will study hard, won't he?

The question tag depends upon the helping verb. Here, will is used. So for question tag won't will be used.

Another example may be:

She is very beautiful, isn't she?

He is poor, isn't he?