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The perfect tenses describe actions which are complete. They have past, present and future forms and require an auxiliary verb > this would be the word before snowed as snow is the action] the auxiliary verb (meaning helper verb) also makes the sentence sound complete.

Past tense: Yesterday, it had snowed 5 inches by nightfall. 

Present tense: It has snowed 5 inches today. 

Future tense: By nightfall, it will have snowed 5 inches. 

14 years ago. Rating: 4
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Colleen did a good job, mone.......Hope she has helped you...{ :D

14 years ago. Rating: 2
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