The difference between as and which attributive clauses

The differences between as and which attributive clauses in meaning, usage and emphasis.

First, the meaning is different.

1.as meaning: as; be just like

2. Which meaning: which one; which

Second, the usage is different.

Usage of 1.as: When the actions of two subjects occur at the same time, the predicate verbs of the main clause and the subordinate clause can be used in the progressive tense or the general form, regardless of the length of the actions; When the time interval between two events is very short, or even there is no time interval, both the main clause and the subordinate clause use the simple past tense.

Example:

As a fledgling journalist, he will know the truth of life in the press.

As a fledgling journalist, he needs to know the inside story of his journalism career.

2.which usage: used as a relative pronoun, it can guide restrictive attributive clauses or non-restrictive attributive clauses. When guiding non-restrictive attributive clauses, you can use the whole main clause as the antecedent, which is equivalent to and that, and sometimes you can guide infinitive phrase clauses.

Example:

What are the best headache tablets?

Which pills are best for headaches?

Third, the emphasis is different.

1.as emphasizes: used in the simple present tense.

2. Which focus: Used in the simple present tense or the simple future tense.