Question

You __ buy this book. It is worth buying (advice or Suggestion)

Answer 1

Answer:

may is the answer ......

Answer 2

Answer:

You shall buy this book.

Explanation:

The verb that has been used here is the modal verb.

Modal verbs, also known as auxiliary verbs can be defined as the verbs that involves a suggestion,Order ,permission or advice.

Some examples for modal verbs are should, could, must, might, will etc.

Some of the properties of modal verbs are as follows,

1.There form can never be changed . Hence, the addition of -ed or -ing is not possible

2. They are always followed by an infinitive of another verb.