Modals Verbs of Ability & Possibility

1. Since the space telescope began operating in 2022, astronomers ---- observe galaxies that formed less than three hundred million years after the Big Bang.

Present Perfect Tense & Present Perfect Continuous Tense

2. It is the first time in its ninety-year history that the academy ---- the prize to two candidates at once; every previous award went to a single scholar.

Modals Verbs of Obligation, Necessity & Prohibition

3. The committee's decision to release the preliminary findings without independent replication now looks reckless: the results ---- by a second laboratory long before any public announcement was made.

Future Tenses

4. The two delegations ____ the trade agreement in front of the cameras when a last-minute objection raised by one of the observers brought the whole ceremony to a halt.

Future Tenses

5. The department's field trip starts on Monday morning, so this time next week the geology students ____ rock samples along the eastern ridge instead of sitting in the lecture hall.

Present Perfect Tense & Present Perfect Continuous Tense

6. Since the laboratory ---- the automated sequencing protocol in 2019, the number of samples it can process in a single working day ---- more than fourfold.

Modals Verbs of Ability & Possibility

7. Her coat was still hanging behind the door and her coffee cup had been left half full; since nothing else could account for the state of the office, the researcher ---- the building in a great hurry.

Modals Verbs of Obligation, Necessity & Prohibition

8. Before digital archives became widely available, doctoral students ---- to distant libraries and copy rare manuscripts by hand, a process that could easily consume an entire summer.

Types of Pronouns

9. Unlike the earlier prototype, which had to be recharged every two hours, the device now being tested by the engineering team stores most of ---- operating energy in a graphene capacitor.

Modals Verbs of Ability & Possibility

10. With her publication record and her fluency in three languages, Dr. Aydın ---- the international research grant without much difficulty, but she chose to remain in the private sector and never even applied.

Present Perfect Tense & Present Perfect Continuous Tense

11. Professor Demirsoy ---- the current director of the institute since the two of them were graduate students in Vienna, which is why her recommendation carries so much weight in the department.

Modals Verbs of Obligation, Necessity & Prohibition

12. Once the automated logging system is installed next semester, the technicians ---- each measurement manually, which will free them for the far more demanding analytical work the department has been postponing.

Past Simple Tense & Past Continuous Tense

13. While the committee was still debating the wording of the final paragraph, one of the observers quietly ---- the room and never returned.

Types of Pronouns

14. The two anonymous referees to ---- the manuscript had been sent in the first round both recommended outright rejection, yet the editor chose to invite a substantially revised version.

Past Simple Tense & Past Continuous Tense

15. The photograph captures a single instant in the summer of 1962: children ---- in the square, vendors were shouting their prices, and a tram was crawling past the fountain.

Past Simple Tense & Past Continuous Tense

16. Until the theory of plate tectonics gained acceptance in the 1960s, most geologists ---- that the continents had always occupied their present positions.

Modals Verbs of Obligation, Necessity & Prohibition

17. Ayla ---- the entire dataset by hand over three exhausting weekends; she found out only afterwards that a free conversion tool would have done exactly the same job in a matter of seconds.

Present Perfect Tense & Present Perfect Continuous Tense

18. Dr. Ateş ---- to the Antarctic research station three times so far, and she is due to fly out there once again in November.

Present Perfect Tense & Present Perfect Continuous Tense

19. The manuscript was sent out for review eight months ago, but the editors ---- the authors any feedback ----.

Present Perfect Tense & Present Perfect Continuous Tense

20. The evaluation committee ---- its final report to the ministry last Thursday, but the document has not been made public yet.