You use the past tense of a verb (e.g. sang) when the subject is being talked about in the past (the simple past tense). You use the past participle (e.g. have/has sung) when the subject is being talked about in the present (the present perfect tense). "Sung" is the past participle and "have/has" is an auxiliary verb that implies that the subject is referring to a past action in relation to the current present state.
By is not a verb and does not have participle forms; however, buy is a verb. The past participle is bought.
Meat is not a verb and does not have participle forms. However, meet is a verb. The past participle is met.
Below is not a verb, but bellow is a verb. Bellowed is the past participle of bellow.
Only verbs have past participles. The main verb in the sentence is go and the past participle of go is gone.Do is also a verb and the past participle of do is done. But do is not the main verb in this sentence it is an auxiliary verb.
Because rescue is a regular verb the past and the past participle is rescued.
"Use" is a regular verb; therefore, its past participle is "used".
The present participle of the verb "use" is "using" and the past participle is "used."
The perfect tenses are formed by using the auxiliary verb "have" followed by the past participle of the main verb. For example, in the present perfect tense, you use "have" or "has" followed by the past participle. In the past perfect tense, you use "had" followed by the past participle.
The past participle of the verb "study" is "studied."
The past participle of the verb "develop" is "developed."
The past participle of the verb "be" is "been."
visit is a regular verb so the past and the past participle are both verb + ed ievisitedvisited is the past participle of the verb visit.
The past participle of the verb "occur" is "occurred."
The past participle of the verb "like" is "liked".
By is not a verb and does not have participle forms; however, buy is a verb. The past participle is bought.
The past participle of the verb to do is "done."
The past participle of the verb die is died.