Learn English – “as” as a conjunction or preposition

asword-usage

1: He doesn't play half as well as his sister does.

2: He doesn't play half as well as his sister.

In sentence one, the second "as" is a conjunction. Am I right?
In sentence two, should I take the second "as" as a preposition or as a conjunction with "does" being omitted?

Thank you very much!

Best Answer

In both sentences, "as" is used as an adverb because it is comparing two things. It is used as a conjunction when something happening continuously over a period of time.

As he got worked harder, his grades improved.

That is an example of "as" as a conjunction. "As" is used as a preposition when referring to a characteristic something has.

They were treated as kings.

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