Wrong: I have planted three trees last year.
Correct: I planted three trees last year.

• It is often used with never and yet. It is used in questions with ever.

  I have never planted a tree.
  We haven't planted any trees yet.
  Have you ever hugged a tree?

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The present perfect simple tense is made with has/have + the past participle.

I / we / you / they have always loved trees.
He / she / it has always loved trees.

I / we / you / they have never had asthma.
He / she / it has never had asthma.

Have I / we / you / they / ever planted a tree?
Has she / he / it ever planted a tree?

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Exercise 1:
Fill the gaps in the sentences with the verbs in brackets. Put them in the present perfect simple.

a. I __________ a lot of articles about this problem. (read)
b. He __________to Canada. (go)
c. __________ you ever __________ on a farm? (work)
d. We __________more and more trees from our city over the last ten years. (lose)
e. She __________ very kind to me. (be)
f. I __________ on a farm all my life. (live)
g. They __________ us to build new pigsties for our pigs.(tell)
h. We __________ pigs for the last six years. (keep)

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Exercise 2:
Here are some time words. Sort the words into two groups.
Group A: Those words that describe a finished time
Group B: Those that describe an unfinished time. (Two are done for you as an example.)

in 2003, this week, last year, since 2002, two minutes ago, yesterday, this month, three weeks ago, on Saturday, today, this evening

Finished	Unfinished
in 2003	this week

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Exercise 3:
Fill the gaps in the sentences with the verb in the brackets. Use either the present perfect simple or the simple past tense.

a. I _______ on a farm in 2003. (work)
b. I _______ on a farm since 2004. (live)
c. I _______ six pigs this month. (sell)
d. I _______ the pigsty yesterday. (clean)
e. I _______ the news about the new pig law five minutes ago. (hear)
f. It _______ sunny and windy today. (be)

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Answer Key:
Exercise 1
a. I have read a lot of articles about this problem.
b. He has gone to Canada.
c. Have you ever worked on a farm?
d. We have lost more and more trees from our city over the last ten years.
e. She has been very kind to me.
f. I have lived on a farm all my life.
g. They have told us to build new pigsties for our pigs.
h. We have kept pigs for the last six years.

Exercise 2
Group A Finished Time: last year, two minutes ago, yesterday, three weeks ago, on Saturday,
Group B Unfinished Time: since 2002, this month, today, this evening

Exercise 3
a. I worked on a farm in 2003.
b. I have lived on a farm since 2004.
c. I have sold six pigs this month.
d. I cleaned the pigsty yesterday.
e. I heard the news about the new pig law five minutes ago.
f. It has been sunny and windy today.