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Additionally, nouns can take suffixes that assign person: for example -imiz 4, "our". With the addition of the copula (for example -im 4, "I am") complete sentences can be formed. The interrogative particle mi 4 immediately follows the word being questioned, and also follows vowel harmony: köye mi? "[going] to the village?", ağaç mı? "[is it a] tree?".[citation needed]