The subordinate clause in this sentence is because I forgot to buy milk. The whole sentence is used as an adverb. Adverbs are used to answer questions such as where, when, or in this case, why.
Why did I have root beer in my cereal? Because I forgot to buy milk.
Yes she did hear the car traveling down the road.
Rlly...
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Weak-sense critical thinkers in an opposing argument but often times do not find the merits of that argument. strong-sense critical thinkers are able to weigh both side of an argument able to be open to the merits in an opposing argument as well as being able to admit flaws in their own argument.