Answer Key:
- is developed — The sentence is in the present passive form, indicating that immunotherapy is currently being developed.
- are treated — This is the present passive form, showing that many cancers are treated with these drugs.
- The immune system is trained to see cancer as a threat by scientists. — The correct form should be "The immune system is trained by scientists to see cancer as a threat." The original sentence incorrectly places the agent after the action.
- Some patients are helped by CAR T-cell therapy. — This sentence is correct as it is in the passive voice, focusing on the patients receiving help.
- How the immune system and cancer are connected was studied by scientists. — This transforms the active voice into passive, focusing on the action of studying.
- The modified T-cells are put back into the patient’s body by doctors. — This changes the active voice to passive, emphasizing the action taken on the T-cells.
- are helped — This is the correct passive form, indicating that many patients receive help from immunotherapy.
- a) i,
b) ii — The first sentence indicates ongoing research, while the second describes the use of checkpoint inhibitors in treatments.
Grammar Point: Reported Speech (Tense Backshift)
Why this point appears in the article: The article discusses the historical development of immunotherapy, which can involve reported speech to convey what scientists believed or discovered in the past.
What learners need to understand: In reported speech, the tense often shifts back one step when reporting what someone said or thought. For example, present simple changes to past simple, and present perfect changes to past perfect. Learners should be aware of these changes and how to apply them correctly.
Exercises:
Fill in the blank
Change the direct speech into reported speech.
- Scientists say, "Immunotherapy helps the immune system."
Scientists ___ that immunotherapy ___ the immune system.
- People believed, "This idea sounds like science fiction."
People ___ that this idea ___ like science fiction.
Error correction
Identify and correct the mistake in the reported speech.
3. Scientists said that they are studying how the immune system and cancer are connected.
4. The researchers thought that immunotherapy is a new way to treat cancer.
Sentence transformation
Transform the following sentences into reported speech.
5. "We are seeing big changes in cancer treatment," the doctors said.
6. "Checkpoint inhibitors help treat many types of cancer," the researcher explained.
Fill in the blank open
Complete the sentence in reported speech.
7. The article states, "Immunotherapy is a big step in understanding cancer."
The article states that immunotherapy ___ a big step in understanding cancer.
Jumbled sentence reordering
Reorder the words to form a correct reported speech sentence.
8. that / scientists / believed / it / was / possible / to / use / the immune system / fight cancer.
Answer Key:
- said; helps — The present simple "helps" changes to "helps" in reported speech, as the statement is still true.
- believed; sounded — The present simple "sounds" changes to past simple "sounded" in reported speech.
- Scientists said that they were studying how the immune system and cancer are connected. — The present continuous "are studying" should be changed to past continuous "were studying."
- The researchers thought that immunotherapy was a new way to treat cancer. — The present simple "is" should be changed to past simple "was."
- The doctors said that they were seeing big changes in cancer treatment. — The present continuous "are seeing" changes to past continuous "were seeing."
- The researcher explained that checkpoint inhibitors helped treat many types of cancer. — The present simple "help" changes to past simple "helped."
- is — The correct form is "is," which remains unchanged because it is a general truth being reported.
- Scientists believed that it was possible to use the immune system to fight cancer. — The correct order emphasizes the belief of scientists in the past.
Grammar Point: Gerunds vs Infinitives
Why this point appears in the article: The article discusses various treatments and methods, which can involve verbs that are followed by either gerunds or infinitives, such as "help" and "try."
What learners need to understand: Some verbs are followed by gerunds (verb + -ing) while others are followed by infinitives (to + verb). At B1 level, learners should be able to distinguish between these and understand how the meaning can change depending on which form is used.
Exercises:
Fill in the blank
Complete the sentences using the correct form (gerund or infinitive) of the verb in parentheses.
- Immunotherapy helps the immune system ___ (fight) cancer cells.
- Scientists started ___ (study) how the immune system and cancer are connected.
Error correction
Identify and correct the mistake in the gerund or infinitive usage.
3. The researchers tried to finding new ways to treat cancer.
4. Many patients enjoy to receive immunotherapy.
Sentence transformation
Transform the sentences using the correct form (gerund or infinitive).
5. The scientists decided to explore new treatments.
6. Some patients dislike waiting for results.
Fill in the blank open
Write a sentence using the correct form (gerund or infinitive) based on the prompt.
7. The doctors recommend ___ (try) immunotherapy.
Matching
Match the verbs to their correct forms (gerund or infinitive).
8.
a) start
b) enjoy
i) to study
ii) studying
Answer Key:
- fight — The infinitive form "to fight" is used after "helps."
- studying — The gerund form "studying" is used after "started."
- The researchers tried to find new ways to treat cancer. — The gerund "finding" should be corrected to the infinitive "to find."
- Many patients enjoy receiving immunotherapy. — The infinitive "to receive" should be corrected to the gerund "receiving."
- The scientists decided to explore new treatments. — This sentence is correct as "decided" is followed by the infinitive form.
- Some patients dislike waiting for results. — This sentence is correct as "dislike" is followed by the gerund form.
- trying — The correct form is "trying," indicating the recommendation to attempt immunotherapy.
- a) ii,
b) i — "Start" is followed by a gerund, while "enjoy" is followed by a gerund.