which principle part of the verb hear is used in this sentence-You problably have heard the name unesco
In this sentence, heard is the past participle of hear.
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To determine the principle part of the verb "hear" used in the sentence "You probably have heard the name UNESCO," we need to understand the concept of verb conjugation.
In English, verbs have four principle parts: the base form (infinitive), the past tense, the past participle, and the present participle.
The base form of the verb "hear" is "hear" itself.
The past tense of "hear" is "heard."
The past participle of "hear" is also "heard."
The present participle of "hear" is "hearing."
In the given sentence, the word "heard" is used, which is the past tense form of the verb "hear."
To find the principle part, we look for clues in the sentence. Since the sentence is in the present perfect tense ("have heard'), the past participle form of the verb is needed. In this case, "heard" is the past participle form and is used to show a completed action.