In the sentence, The hummingbird is the only bird that can fly backward, the verb is either "is" or "can fly"

I cannot determine what the subordinate clause is.

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In the sentence "The hummingbird is the only bird that can fly backward," the subordinate clause is "that can fly backward." This subordinate clause provides additional information about the only bird being referred to, specifying its unique ability to fly backward. The main verb in the sentence is "is," while "can fly" is a verb phrase indicating the action the bird is capable of.

To identify the subordinate clause in a sentence, it is necessary to locate the dependent clause that cannot stand alone as a complete sentence. In the given sentence, "The hummingbird is the only bird that can fly backward," the main clause is "The hummingbird is the only bird." This is the independent clause that can stand alone as a sentence. The subordinate clause is "that can fly backward," which functions as a dependent clause because it cannot form a complete sentence on its own.

Which of these clauses cannot stand alone?

The hummingbird is the only bird

that can fly backward,