1. I / grow / flowers since 2005 2. You / run / very much lately

3. Tim and Sonia / live / in Rome since May

4. Mark / exercise / regularly

5. They / read / much recently

1. I have been growing flowers since 2005.
In this sentence, the verb "grow" is in the present perfect tense to indicate an action that started in the past (2005) and is still continuing in the present. To form the present perfect tense, we use the helping verb "have" followed by the past participle form of the verb (grown). So the correct sentence should be "I have been growing flowers since 2005."

2. You have been running very much lately.
In this sentence, the verb "run" is also in the present perfect tense. The word "lately" indicates that the action of running has been happening recently. Again, we use the helping verb "have" followed by the past participle form of the verb (run). Therefore, the correct sentence is "You have been running very much lately."

3. Tim and Sonia have been living in Rome since May.
In this sentence, the verb "live" is also in the present perfect tense. The phrase "since May" indicates that the action of living in Rome started in May and is continuing in the present. Using the helping verb "have" followed by the past participle form of the verb (lived), we get the correct sentence: "Tim and Sonia have been living in Rome since May."

4. Mark has been exercising regularly.
In this sentence, the verb "exercise" is in the present perfect tense. There is no specific time mentioned, so it implies that the action of exercising has been happening recently and is still continuing. Hence, the correct sentence is "Mark has been exercising regularly."

5. They have been reading a lot recently.
In this sentence, the verb "read" is in the present perfect tense. The word "recently" indicates that the action of reading a lot has been happening in the recent past and is still continuing. Using the helping verb "have" followed by the past participle form of the verb (read), the correct sentence is "They have been reading a lot recently."

To summarize, the given sentences are all in the present perfect tense, which is used to talk about actions that started in the past and are still happening in the present. The formation of the present perfect tense involves using the helping verb "have" (has for the third person singular) followed by the past participle form of the main verb.