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1. 12 MCQS on Used and Would in English
2. 12 MCQS on Adverbs in English
3. 12 MCQS on Question Tags in English
4. MCQS on Use of Each Every and All in English
5. Best 12 MCQS on Passives in English Grammar
6. Best 12 MCQS on Definite and Indefinite Articles
7. Best 12 MCQS on Whose Whom and Where
8. Best 12 MCQS on Pronouns in English Grammar
9. Best 12 MCQS on Use of Will VS Shall
10. Best 12 MCQS on Preposition in English
11. Best 12 MCQS on Gerund and Infinitives in English
12. Best 12 MCQS on Can and Could in English
13. Best 12 MCQS on Prefer and Would Rather
14. Best 12 MCQS on Determiners in English
15. Best 12 MCQS on Simple, complex and compound sentences
16. Best 12 MCQS on Reported Speech in English
17. Best 12 MCQS on Degrees of Comparison in English
18. 12 MCQS on Conjunctions in English
By and Until are two prepositions that express the idea of before or up to a particular time.
By is used to refer to a particular point in time, whether that be today, tomorrow, or any specific date/time.
Example:
I need to finish the report by Friday.
Until is used to refer to a period of time leading up to a particular point—it is used when speaking of something that will happen in a more discrete period of time.
Example:
I will work on the report until 5 pm.
In summary: By refers to a specific point in time, and until is used for a period of time leading up to that point.