Grammar C Put the verbs into the correct past tense. 19 Benjamin (gasp) in horror when he saw the ghostly figure. 20 Claire (drive) along a country road when a huge creature came out of nowhere and fell onto her car. 21 While Lisa (read) a book, her brother was listening to music. 22 It was the first time that Elizabeth (ever/see) pictures of Bigfoot. 23 Sandra (paint) for three years before she sold her first painting. 24 Alex didn't go to the photographic exhibition because he (not/finish) his homework 25 The research team (find) an unusual fossil and took it back to the tab to examine it.

Grammar C Put the verbs into the correct past tense.

19 Benjamin gasped in horror when he saw the ghostly figure.

To form the past tense of "gasp", we add "ed" at the end. Therefore, the correct answer is "gasped". Benjamin gasped in horror when he saw the ghostly figure.

20 Claire was driving along a country road when a huge creature came out of nowhere and fell onto her car.

To form the past tense of "drive", we change the verb to its past form. The past tense of "drive" is "drove". Therefore, the correct answer is "drove". Claire was driving along a country road when a huge creature came out of nowhere and fell onto her car.

21 While Lisa was reading a book, her brother was listening to music.

To form the past tense of "read", we change the verb to its past form. The past tense of "read" is "read". Therefore, the correct answer is "read". While Lisa was reading a book, her brother was listening to music.

22 It was the first time that Elizabeth had ever seen pictures of Bigfoot.

To form the past tense of "see", we change the verb to its past participle form. The past participle of "see" is "seen". Additionally, we use the past perfect tense "had" to indicate that seeing the pictures of Bigfoot had occurred before. Therefore, the correct answer is "had ever seen". It was the first time that Elizabeth had ever seen pictures of Bigfoot.

23 Sandra had been painting for three years before she sold her first painting.

To form the past tense of "paint", we use the past perfect tense "had been" to indicate an action that occurred before another past action. Additionally, we change the verb to its past participle form. The past participle of "paint" is "painted". Therefore, the correct answer is "had been painting". Sandra had been painting for three years before she sold her first painting.

24 Alex didn't go to the photographic exhibition because he had not finished his homework.

To form the past tense of "not finish", we use the past perfect tense "had not" to indicate an action that did not occur before another past action. Additionally, we change the verb to its past participle form. The past participle of "finish" is "finished". Therefore, the correct answer is "had not finished". Alex didn't go to the photographic exhibition because he had not finished his homework.

25 The research team found an unusual fossil and took it back to the lab to examine it.

To form the past tense of "find", we change the verb to its past form. The past tense of "find" is "found". Therefore, the correct answer is "found". The research team found an unusual fossil and took it back to the lab to examine it.