Asked by Lance Henderson on Jul 04, 2024
Verified
Select the correct past participle for each blank. For many decades, tungsten filaments have been ____ by makers of contemporary light bulbs, with life spans of 750 to 4,000 hours.
A) use
B) used
Past Participle
A verb form that is typically used to express completed action, often used in perfect tenses and sometimes as an adjective.
Tungsten Filaments
Thin wires made of tungsten used as the essential heating element in incandescent light bulbs and other devices.
Light Bulbs
Electric devices used to produce light from electricity, typically found in homes, workplaces, and various devices.
- Understand accurately the structure and use of past participles in sundry sentence structures.
- Familiarize with the historical and contextual usage of past participles in English.
Verified Answer
GF
Geoffrey FallonJul 09, 2024
Final Answer :
B
Explanation :
The sentence is in the present perfect tense, indicating ongoing action up to the present. Therefore, the past participle form is needed, and "used" is the correct past participle form of "use."
Learning Objectives
- Understand accurately the structure and use of past participles in sundry sentence structures.
- Familiarize with the historical and contextual usage of past participles in English.