The present perfect continuous is formed with have/has + been + present participle (-ing form of a verb).
The past tense for "strive" would be "strived" or "strove".
The simple past is strove. The past participle is striven.
The present tense is strive.
Past perfect tense, past perfect continuous tense, present perfect tense, present perfect continuous tense, future perfect tense and future perfect continuous tense.
There are two forms of the present perfect tense: simple present perfect (I have eaten) and progressive present perfect (I have been eating). Both forms use "have" or "has" with the past participle of the main verb to indicate an action that started in the past and has relevance to the present.
Actually, "have" is the present tense form for first and second person plural (I, you, we, they) while "has" is the present tense form for third person singular (he, she, it). For example: "I have, you have, we have, they have" versus "he has, she has, it has."
There is only one tense in the present tense, but within that tense, there are four aspects that includes simple present, present continuous, present perfect, and present perfect continuous.
1)Simple Present Tense, 2)Simple Past Tense, 3)Simple Future Tense, 4)Present Continuous Tense, 5)Past Continuous Tense, 6)Future Continuous Tense, 7)Presnt Perfect Tense, 8)Past Perfect Tense, 9)Future Perfect Tense, 10)Present Perfect Continuous Tense, 11)Past Perfect Continuous Tense, 12)Future Perfect Continuous Tense.
Present perfect tense - have/has gone. Present perfect continuous tense - have/has been going. Past perfect tense - had gone. Past perfect continuous tense - had been going. Future perfect tense - will have gone. Future perfect continuous tense - will have been going.
Present continuos tense: am/is/are excelling Present perfect continuous: have/has been excelling Past continuous tense: was /were excelling Past perfect continuous: had been excelling Future continuous tense: will be excelling Future perfect continuous: will have been excelling
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".
The present perfect continuous tense of fly is:I/You/We/They have been flying.He/She/It has been flying.
It is the present continuous tense.
Past tense - shared. Present tense - I/you/we/they share. He/she/it shares. Future tense - will share. Past perfect tense - had shared. Present perfect tense - I/you/we/they have shared. He/she/it has shared. Future perfect tense - will/shall have shared. Past perfect continuous tense - had been sharing. Present perfect continuous - I/you/we/they have been sharing. He/she/it has been sharing. Future perfect continuous - will have been sharing.
This form of the verb can be used in more tenses: present participle, present continuous, past continuous, past perfect continuous, future perfect continuous, future continuous, present perfect continuous.