a) We have traveled to Asia and Africa. b) We have run 100 kilometers. c) I have injured my leg. d) They have swum

Present Perfect Tense:
Описание:
The Present Perfect Tense in English is used to describe actions or events that started in the past but have a relevance to the present. It is formed by using the auxiliary verb "have" or "has" followed by the past participle form of the main verb.

In the given sentences:
a) We have traveled to Asia and Africa.
This sentence indicates that the speaker and others have traveled to Asia and Africa at some point in the past, but it is not specified when exactly. The action of traveling is completed, and there is a connection to the present time.

b) We have run 100 kilometers.
This sentence suggests that the speaker and others have completed running a distance of 100 kilometers. The action started and finished in the past, and the focus is on the result or outcome.

c) I have injured my leg.
This sentence implies that the speaker has hurt their leg at some point in the past, and the injury is still having an impact on the present.

d) They have swum in a lake.
This sentence states that a group of people has swum in a lake in the past. Again, the exact time is not specified, but the focus is on the experience of swimming in the lake.

e) Joe and I haven"t done any extreme sports.
This sentence indicates that neither Joe nor the speaker have engaged in any extreme sports up until now. The lack of experience is relevant to the present.

f) She has won a prize!
This sentence communicates that she has won a prize, suggesting that this action has happened recently or in the recent past.

g) They have called the rescue services.
This sentence tells us that the group of people has contacted the rescue services. The focus is on the completed action and its connection to the present.

h) They have written a blog.
This sentence implies that they have completed the act of writing a blog. The blog is finished, but the result is still relevant to the present.

Например:
Please rewrite the following sentences in the Present Perfect Tense:

1) I (eat) lunch.
2) She (read) five books.
3) We (visit) Paris last summer.
4) They (paint) their house.

Совет:
To better understand and use the Present Perfect Tense, it"s important to learn the irregular past participles of common verbs. Regular past participles end in "-ed," but many verbs have irregular forms. Building a vocabulary of irregular past participles can help in constructing correct sentences.

Задача для проверки:
Rewrite the following sentences in the Present Perfect Tense:

1) He (see) that movie already.
2) We (not finish) our homework yet.
3) She (not visit) her grandparents for a long time.
4) They (eat) at that restaurant before.