1. an adverb clause will always contain a subject, verb, and subordinate conjunction (this is what keeps it from being a complete sentence)
<span>2) until his arms ached. (his arms = subject, ached = verb, until = subordinate conjunction)
3) once they saw her car turn the corner. (</span>they = subject, saw = verb, once = subordinate conjunction)
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4) When the storm started (</span>the storm = subject, started = verb, when = subordinate conjunction)
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5) while being taught to bake cupcakes. (</span>she = subject, taught = verb, while = subordinate conjunction)
The subject is sponge because that is what is the main point of the sentence is.
It is a big square surrounded by a big stadium
