1. Exercise—Present Tense
Which sentences are incorrect?
I thought that my co-worker is usually helpful.
Marie goes out for lunch with her friends every Saturday.
Fearsome foes made untrustworthy allies.
Fred always talked too much because he is insecure.
California was on the west coast.

2. Answers Which sentences are incorrect?
I think that my co-worker is usually helpful.
Marie goes out for lunch with her friends every Saturday.
Fearsome foes make untrustworthy allies.
Fred always talks too much because he is insecure.
California is on the west coast.

3. Exercise—Simple Past Tense
Which sentences are incorrect?
Yesterday, I go to Magic Mountain.
I work all night on my homework, so when I woke up this morning I am very tired.
When she worked in the library, she read many books.
Back in 2001, I received my degree.
I live in Walnut for ten years before I move to Covina.

4. Answers Which sentences are incorrect?
Yesterday, I went to Magic Mountain.
I worked all night on my homework, so when I woke up this morning I was very tired.
When she worked in the library, she read many books.
Back in 2001, I received my degree.
I lived in Walnut for ten years before I moved to Covina.

5. Exercise—Using Present and Past Tenses
Yesterday I (go/went) with five of my friends to Magic Mountain. This (is/was) my favorite amusement park in Southern California. I always (have/had) a great time because I (love/loved) roller coasters. I (remember/remembered) going there when I was in high school and how much fun I had. Magic Mountain (has/had) 18 roller coasters, and we (plan/planned) to ride them all. But when we got in line for Goliath, my friend Aaron (change/changed) his mind. I should have remembered that he (is/was) afraid of roller coasters. Just one look at a roller coaster and he (feels/felt) terrified. He always (backs/backed) out right before getting on the ride, and this time (is/was) no different. By the end of the day, Aaron (realize/realized) that he had wasted his money going to Magic Mountain.

6. Answers
Yesterday I went with five of my friends to Magic Mountain. This is my favorite amusement park in Southern California. I always have a great time because I love roller coasters. I remember going there when I was in high school and how much fun I had. Magic Mountain has 18 roller coasters, and we planned to ride them all. But when we got in line for Goliath, my friend Aaron changed his mind. I should have remembered that he is afraid of roller coasters. Just one look at a roller coaster and he feels terrified. He always backs out right before getting on the ride, and this time was no different. By the end of the day, Aaron realized that he had wasted his money going to Magic Mountain.

7. Exercise—Using Simple Future Tense
Which of the following sentences are incorrect?
It will difficult to persuade her go on the trip.
Andrea will takes me out to lunch.
We are going to meet at the restaurant at 7:00.
I will show you where the classroom is.
I’m afraid she’s going to be angry when she sees the mess we made.
Miguel and Travis will going to be roommates.

8. Answers It will be difficult to persuade her go on the trip.
Andrea will take me out to lunch.
We are going to meet at the restaurant at 7:00.
I will show you where the classroom is.
I’m afraid she’s going to be angry when she sees the mess we made. OR I’m afraid she will be…
Miguel and Travis are going to be roommates.

9. Exercise—Present Perfect Tense
Which sentences are incorrect?
I worked at Best Buy for two years, and I plan to stay there until I graduate.
My opponent insulted me on several occasions. I don’t expect him to stop now.
She has hiked to the top of Mt. Baldy last weekend.
My professor wrote several letters of recommendation for me before. I hope she will write one more for me.

10. Answers
I have worked at Best Buy for two years, and I plan to stay there until I graduate.
My opponent has insulted me on several occasions. I don’t expect him to stop now.
She hiked to the top of Mt. Baldy last weekend.
My professor has written several letters of recommendation for me before. I hope she will write one more for me.

11. Exercises—Past Perfect Tense
I (studied/had studied) hard for the test, but I still (failed/had failed).
I (hurried/had hurried) to the phone, but the caller (hung/had hung) up.
I (had arrived/arrived) home late because there (was/had been) a lot of traffic.
I had never seen such a beautiful beach before I (went/had gone) to Kauai.
On his last trip there, Brendan (knew/had known) Boston so well because he (visited/had visited) the city several times.

12. Answers I had studied hard for the test, but I still failed.
I hurried to the phone, but the caller had hung up.
I arrived home late because there had been a lot of traffic.
I had never seen such a beautiful beach before I went to Kauai.
On his last trip there, Brendan knew Boston so well because he had visited the city several times.