Complete the sentences with the present perfect form of one of the verbs. I haven’t posted (not post / not create) any messages recently. 1. Jack (blog / create) a website. 2. We (not email / not post) anyone today. 3. Luke (blog / download) some fantastic music. 4. You (not share / not message) your files this week. 5. We (use / email) instant messaging a lot of times.

1. Jack has created a website. To form the present perfect tense, we use the helping verb "has" or "have" followed by the past participle form of the verb. In this case, the past participle form of "create" is "created."

2. We haven't emailed or posted anyone today. The negative form of the present perfect tense is formed by adding "not" after the helping verb "have." In this case, the past participle form of "email" is "emailed" and the past participle form of "post" is "posted."

3. Luke has downloaded some fantastic music. Again, we use the helping verb "has" or "have" followed by the past participle form of the verb. In this case, the past participle form of "download" is "downloaded."

4. You haven't shared or messaged your files this week. Once again, to form the negative present perfect tense, we add "not" after the helping verb "have." The past participle forms of "share" and "message" are "shared" and "messaged" respectively.

5. We have used email instant messaging a lot of times. In this sentence, we use the verb "use" in its base form because it is already in the present perfect tense. The past participle form of "use" is "used." Therefore, we simply use the base form "use" without any changes.