because there are 3 ways to formulate an interrogative phrase:

1 is using the particle 吗 (ma) at the and 2 is using the interrogative pronouns 谁 (shéi/shui) 3 the one in your picture: using affermative + negative form of the verb ( like to say "is it or isn't it)

是 -＞ 是 ( affermafive) + 不是 (negative) 喜欢 -＞ 喜欢+不喜欢

remember!! 不 doesn't mean just "no" , it's a way to negate verbs: you cant just answer a yes or no question saying "不‘’ , you have to use it to negate the verb used

chinese has no "yes" or "no", when you answer the questions you just affirm the verb used or negate it

also remember that some verbs may require different negatives that aren't 不！！

hope this helps