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Question

Difficulty: EasyVerbs, Tenses, and Aspect

Fill in the blank with the grammatically correct verb form to complete the sentence.

Answer:The students 【have been studying】 in the library since eight o'clock this morning.

Answer

have been studying (or have studied)
The present perfect continuous form 'have been studying' (or present perfect 'have studied') correctly denotes an activity that began at a specified point in the past ('since eight o'clock') and persists into the present.

Step-by-Step Solution

1
Analyze the temporal marker 'since eight o'clock this morning'.
The preposition 'since' specifies a starting point in the past for an action that continues into the present.
Actions originating in the past and continuing to the present require the present perfect or present perfect continuous aspect.
2
Ensure subject-verb agreement and correct aspectual auxiliary selection.
The plural subject 'The students' requires 'have been studying' (or 'have studied').
Singular auxiliaries or simple past tenses fail to convey the ongoing timeframe specified by 'since'.

Key Concept

Present Perfect and Present Perfect Continuous Aspect with Temporal Markers
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Topics

Verbs, Tenses, and Aspect

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