There is a book on the desk_____ ?

There is a book on the desk_____ ?

isn't there
For details, please see:
English antonym
1) The subject of the statement part is I, and the interrogative part is Allen't I
I'm as tall as your sister,aren't I?
2) The predicate of the statement part is wish, and the question part uses may + subject
I wish to have a word with you, may I?
3) When negative words such as no, nothing, nobody, never, fee, seldom, hardly, hardly, little are used in the statement part, positive words are used in the question part
The Swede made no answer, did he / she?
Some plants never bloom, do they?
4) The statement part is affirmative, and the question part uses should't / enough't + subject
He ought to know what to do, oughtn't he? / shouldn't he?
5) The declarative part has to + V. (had to + V.), and the interrogative part often uses don't + subject (didn't + subject)
We have to get there at eight tomorrow, don't we?
6) When the predicate of the declarative part is used to, the interrogative part uses didn't + subject or used n't + subject
He used to take pictures there, didn't he? / usedn't he?
7) Had better + V. had't you?
You'd better read it by yourself, hadn't you?
8) The declarative part is "would rather + V", and the interrogative part is "would't + subject"
He would rather read it ten times than recite it, wouldn't he?
9) You'd like to + V in the statement and would't + subject in the question
You'd like to go with me, wouldn't you?
10) The statement part has the question of "must", and the question part depends on the actual situation
He must be a doctor, isn't he?
You must have studied English for three years, haven't you? / didn't you?
He must have finished it yesterday, didn't he?
11) In exclamatory sentences, the interrogative part uses be + subject
What colours, aren't they?
What a smell, isn't it?
12) The statement is made by Neil nor, either… The interrogative part depends on its actual logical meaning
Neither you nor I am engineer, are we?
13) The subject of the declarative part is the demonstrative pronoun or the indefinite pronoun everything, that, nothing, this, and the subject of the interrogative part is it
Everything is ready, isn't it?
14) The declarative part is a subject clause or a compound sentence, and the interrogative part has three situations
a. In the interrogative part of a coordinate compound sentence, the predicate verb is determined by the predicate of the adjacent clause
Mr. Smith had been to Beijing for several times, he should have been in China now, shouldn't he?
b. In a compound sentence with attributive clause and object clause, the predicate of the interrogative part depends on the predicate of the subject sentence
He is not the man who gave us a talk, is he?
He said he wanted to visit Japan, didn't he?
c. The predicate of the above part of the main sentence is the attributive clause guided by think, believe, expect, supose, imagine, etc. the interrogative part corresponds to the object clause to form the opposite interrogative sentence
I don't think he is bright, is he?
We believe she can do it better, can't she?
15) The subject of the statement part is the indefinite pronouns, such as everyone, anyone, somebody, nobody, no one, etc
Everyone knows the answer, don't they? (does he?)
Nobody knows about it, do they? (does he?)
16) For the antonym questions with modal verb dare or need, need (dare) + subject is often used in the interrogative part
We need not do it again, need we ?
He dare not say so, dare you?
When "dare" and "need" are notional verbs, the interrogative part uses the auxiliary verb "do + subject"
She doesn't dare to go home alone, does she?
17) Omit the subject's imperatives and use will you in the interrogative part
Don't do that again, will you?
Go with me, will you / won't you ?
Note: let's begin with an imperative, followed by shall we?
Let us begin with an imperative, followed by will you?
Let's go and listen to the music, shall we?
Let us wait for you in the reading-room, will you ?
18) The declarative part is "there be" structure, and the interrogative part omits the subject pronoun with "there"
There is something wrong with your watch, isn't there?
There will not be any trouble, will there?
19) The negative prefix can not be regarded as a negative word, and its antonym is still in the negative form
It is impossible, isn't it?
He is not unkind to his classmates, is he?
20) When "must" is used to express "conjecture", it determines the antonym according to its conjecture
He must be there now, isn't he?
It must be going to rain tomorrow, won't it?
Quick memory table
The predicate question part of the statement part
I aren't I
Wish may + subject
No, nothing, nobody, never, fee, seldom, hardly, hardly, little and other negative words have positive meanings
Should't / ought't + subject
Have to + V. (had to + V.) don't + subject
Used to didn't + subject or used to didn't + subject
had better + v. hadn't you
Would rather + V. would't + subject
You'd like to + V. would't + subject
It depends on the actual situation
Be + subject in exclamatory sentences
Neither… nor, either… Or depends on its actual logical meaning
The demonstrative pronoun or indefinite pronoun everything, that, nothing, this uses it as the subject
The predicate of coordinate compound sentence is determined by the predicate of adjacent clause
The predicate of the subject-subordinate compound sentence of the object clause is determined by the predicate of the adjacent clause
The principal subordinate compound sentence is determined by the predicate of the principal sentence
Think, believe, expect, supose, imagine, etc
Everybody, anyone, somebody, nobody, no one, plural they, singular He
Modal verb dare or need need need (dare) + subject
Dare and need are the notional verbs do + subject
Will you?
Shall we?
Will you?
There be + there (omitting the subject pronoun)
Negative prefixes can not be regarded as negative words, but still use negative forms

There's a book on the desk

is there a book on the desk
yes,there is.

Under is chair baskball there a the

Is there a basketball under the chair?
I hope I can help you. I wish you a better future_ ∩)O