Hey there,
Helping verbs help the main verb<span> in a sentence by extending the </span>meaning<span> of the </span><span>verb</span><span>.They also add detail to how time is conveyed in a sentence.
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Hope this helps ^_^
~Top
Hang out with friends, try something new or just sleep
The answer is C. : means it could be the start of a new sentence so They would have to be capitalized.