To make present perfect you use have + past participle.
The past participles of regular verbs are easy to remember they all end in -ed
eg walk / walked / walked. (pp is bold)
So you need to learn the past participles of irregular verbs
eg run / ran / run
A past sentence with a regular verb is: I walked to the store.
The present perfect using walk is: I have walked to the store.
A past sentence using an irregular verb is: They ate the cake.
The present perfect using eat is: They have eaten the cake.
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To convert a past tense verb to present perfect tense, you typically need the helping verb "have" followed by the past participle of the main verb. For example: "I ate" (past tense) becomes "I have eaten" (present perfect tense).
The six tenses in English are present, past, future, present perfect, past perfect, and future perfect. Each tense indicates when an action or state of being occurred in relation to the present moment.
"have send" is an incorrect formation of the present perfect tense. The present perfect is created with have/has + past participle. The present perfect tense of send is have sent. The past tense of send is sent, and the past perfect tense is had sent.
The 6 forms of perfect tenses are: present perfect, past perfect, future perfect, present perfect continuous, past perfect continuous, and future perfect continuous.
"Have" is used in the present perfect tense.
The general present tense is "Recall". Simple present is "Recalls". Present continuous tense is "Am/is/are recalling". Present perfect tense is "has/have recalled" and present perfect continuous tense is "Has/have been recalling". The general past tense is "recalled". Simple past - "Recalled". Past continuous- "Was recalling/ were recalling". Past perfect - "Had recalled". Past perfect continuous- "Had been recalling".