Thank you~~Some grammatical issues~~

1. The key to the first question lies in the parallel sentence.

In parallel sentences, they are sentences connected by and, or, but...

If two parallel sentences have the same sentence structure, you can omit the series of the following sentences. verb.

In English, omission is very common. Here we also need to pay attention to the omission of interrogative sentences

For example, are you a student or a teacher?

This is the omission of are you a student or are you a teacher?

That is to say, if the subject and predicate of two parallel sentences are consistent, even the subject can be omitted

2. The focus of the second question is still omission.

In some places where warnings and prompt signs are expressed, part of the predicate verbs can be omitted, that is, auxiliary verbs, linking verbs, etc. can be omitted.

The complete sentence above is salesman is not welcome...

3. In fact, you have misunderstood this sentence.

we try our best is a set of subject-verb-object structures, to create the best music...It is the infinitive of the verb used as an adverbial of purpose, not an attributive clause! ! !

The best one's can itself is wrong, it should be one can, not one's

This should not be a fixed structure. Common ones include this:

come as quickly as you can, here is one can, which is equivalent to possible

That is, the previous sentence is equivalent to, come as quickly as possible.

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This is what you want to say...

If you have any questions, please share them with us! ! !