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The adjective is open. The past participle is opened: Somebody has opened all the windows.
Weight is a noun and we can't use it as a verb. The verb is weigh (without the t).
So is an adverb, and must qualify an adjective or another adverb. Such is an adjective and must qualify a noun
And is a conjunction, and can only join similar forms of speech: He came and sat down. We can't use it instead of the adverbs also and too.