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Unit 18: Present Perfect Tense vs. Past Tense
THE PROBLEMS

She has lived there last year. They didn’t call yet.
Exercise 1: ___1) Circle the verbs (auxiliary verbs, main verbs and past participles). ___2) Write past if the verb is in the past tense and pres perf if the verb is in the present perfect tense.

1. I had a problem with my computer yesterday. past 2. We have already seenthat movie. pres perf 3. Sami has never hiked to the top of a mountain. _________ 4. They were in the basement during the storm. ________ 5. Lee has been late every day since Monday. _________ 6. Many people cried at the end of the movie. _________ 7. Ann didn’t wait for me at the station. __________ 8. I haven’t begun my homework yet. __________
Exercise 2: Look at the sentences and completethe explanations.

1. They finished their homework very late last night.
Explanation: We use _______ because the sentence is in the past tense. a) an auxiliary and past participle b) just a main verb

2. He hasn’t slept at all for two nights.
Explanation: We use _______ because the sentence is in the present perfect tense. a) an auxiliary and past participle b) just a main verb

3.The passengers have already started to board the plane.
Explanation: We use _______ because the sentence is in the present perfect tense. a) an auxiliary and main verb b) an auxiliary and past participle

76 • Unit 18: Present Perfect Tense vs. Past Tense
Copyright © 2006 by David Kehe and Peggy Dustin Kehe • www.ProLinguaAssociates.com • 800-366-4775

4. My boss didn’t like my excuse.Explanation: We use _______ because the sentence is in the past tense. a) an auxiliary and main verb b) an auxiliary verb and past participle

5. The bank opens at 9 a.m. every day except weekends.
Explanation: The verb (opens) is in the ______ tense. a) present b) present perfect c) past

6. Antonio’s father has never forgotten his birthday.
Explanation: The verb (has forgotten) is inthe ______ tense. a) present b) present perfect c) past

7. Sara ate dinner at 6 p.m. last night.
Explanation: The verb (ate) is in the ______ tense. a) present b) present perfect c) past Exercise 3: Write the verb tense for each verb. Use present, present perfect, and past.

present__ 1. calls pres perf_ 3. has called

_________ 5. have lived _________ 7. has built _________ 9. built_________ 11. drank _________ 13. don’t make _________ 15. haven’t made

2. called __________ 4. lived __________ 6. live __________ 8. builds __________ 10. drinks __________ 12. has drunk __________ 14. didn’t make

past

Unit 18: Present Perfect Tense vs. Past Tense • 77

Exercise 4:

Fill in the chart with the correct forms of the verbs.

Base Form clean play play sit teachbuy live write eat give have travel take
Exercise 5:

Present Tense He cleans___ He __________ We _________ I ___________ You _________ She doesn’t ___ They ________ I don’t _______ He __________ We _________ You _________ They ________ She doesn’t ___

Past Tense He cleaned He ________ We ________ I ___________ You_________ She didn’t____ They ________ I didn’t ______ He _________We_________ You_________ They ________ She didn’t____

Present Perfect Tense He has cleaned___ He _______________ We ______________ I ________________ You ______________ She hasn’t _________ They _____________ I haven’t __________ He _______________ We ______________ You ______________ They _____________ She hadn’t _________

Fill in the blanks with verbs from the chart in Exercise 4 andexplain why you chose them.

1. Yesterday, I cleaned my messy bedroom.
Reason: We use simple past with “yesterday.”

2. Mari has sat at her computer since 8 o’clock.
Reason: We use present perfect with “since” and a time

expression. 3. We didn’t write a letter to the newspaper. Reason: We use the base form after “didn’t.”

4. Last year, they ______________ around the world.
Reason:...