Who visited her grandma s grammar knowledge. Why not add auxiliary verbs?

Because the interrogative word who is the subject in the sentence. Do not use "question words + general question sentence order". Use declarative sentence order directly.

Because who is the "subject", it is directly followed by the predicate verb, and there is no need for auxiliary verbs.

Standard Answer:

The used before the verb form here is an important English grammatical phenomenon, i.e., the emphasis on sentence structure. It plays a role in strengthening the tone and emphasizing.

This sentence is a question to the subject, who visited her grandmother? The interrogative word is used as the subject or the subject's predicate, that is, the subject or the subject's predicate is questioned, and its word order is the word order of the declarative sentence. Here who is the subject and visited is the predicate.

The interrogative word is used as other components, that is, the other components are questioned, and the word order is: special interrogative word + general interrogative sentence [special interrogative word + be auxiliary verb modal verb + subject + predicate].

For example: who did she go with? (Here who is used as the object of go with, and who can also be used).

The auxiliary verb is did

did is the past tense of do, and both are auxiliary verbs.

Here who is the subject and is directly followed by the predicate verb.

WHO is the subject, so there is no need to add auxiliary verbs. The interrogative word is used as the subject, and the interrogative sentence does not need to add auxiliary verbs.

which country is bigger, china or canada?

who will come?

1 All who is used to ask the questioner when the subject is known to be a person, without auxiliary verbs.

This is fixed syntax.

This sentence is a special interrogative sentence, and WHO is the subject here. The invented verb is a predicate and does not require an auxiliary verb. If a special question word is used as a component of other sentences, auxiliary verbs must be used.

For example: where did you go last sunday?In this sentence, where is used as a place adverbial, an auxiliary verb is used.

Because this is a special interrogative sentence, the auxiliary verb should be used in the general interrogative sentence.

In fact, did is an auxiliary verb, and did is the past tense of do. It means "Who did it?" ”

The first sentence who is the object and the second sentence who is the subject.

When the verb has a real meaning, it's an ordinary thing, and you need to add an auxiliary verb, not you think like this, so that it can help it succeed, and that's the greatness of the auxiliary verb.

When these words are modal verbs or auxiliary verbs, they don't have a special meaning, so they don't need to be assisted by others to succeed in their own right

Something like Who Wants Ice Cream?Again, who is the subject, without auxiliary verbs.