When to use B verb and when to use auxiliary verb to ask questions in English sentences.

If it is followed by a noun or adjective, please use the be verb, which forms a systematic structure with adjectives, numerals, nouns, prepositional phrases or adverbs and acts as a predicate together, but if it is followed by a verb, please use an auxiliary verb.

Are you a teacher? Teacher is a noun.

Is she pretty? Beauty is an adjective.

Do you like it? Like is a verb.

The so-called auxiliary verbs are words that help to form various tenses, voices, negative sentences and interrogative sentences. Auxiliary verbs are generally meaningless and cannot be used as predicate verbs alone. For example:

(1) is followed by the present participle to form the continuous tense.

She was reading a book at that time. She was reading at that time.

(2) Take the past participle to form the passive voice.

You are invited to attend the meeting. You are invited to attend the meeting.

(3) The infinitive is used as the predicate in the following cases:

(1) means to plan and arrange what will happen.

I will have dinner with John this afternoon. I will have dinner with John this afternoon.

(2) It is forbidden to express instructions, commands and negative tables.

You are going to see the headmaster today. You must see the headmaster today.

(3) said obligations, responsibilities, etc.

You must be back before 5 o'clock. You must be back before 5 o'clock.

(4) It means possibility, which is synonymous with modal verbs may and can.

I can't hear a sound. There is no sound at all.

(5) indicates what happened later, and can be used to indicate fate or predestination.

He will regret this decision. One day he will regret making this decision.

2. The usage of auxiliary verb have

The auxiliary verb have can form the perfect tense or the perfect continuous tense.

He has been a doctor for 10 years. He has been a doctor for ten years.

(2) The infinitive constitutes a predicate, which objectively indicates what must be done.

-Do we have to start working? Must we work at once?

-No, we don't. No, it's not necessary.

3. the usage of 3.do

(1) forms a question or a negative sentence.

How do you know that? How do you know that?

2 strengthen the tone.

He did say that. He did.

Be sure to come and see us. Be sure to come and see us.

(3) Replace the verbs that just appeared in front to avoid repetition.

You like pop music, don't you? You like pop music, don't you?

-Yes, I know. Yes, I like it.

He speaks French as fluently as she does. He speaks French as fluently as she does.

(4) used in inverted sentences.

He never pays attention to what I say. He never pays attention to what I say.

(5) Imperative sentences that constitute negation.

Don't be so careless.

4. The usage of 4.shall and will

(1)shall (should) is used in the future tense of the first person.

I'll think it over. I'll think it over.

I called her and told her that I should go to London. I called her to tell her that I was going to London.

(2)will is used in the future tense of the second and third person, and can be used in all persons in modern English.

He will be 30 next month. He will be 30 next month.