I struggled to finish my test because I hadn't studied the night before.
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In this sentence, "weakly" is an adverb modifying the verb "struggled." It describes how the flounder struggled.
Maria struggled to lift the heavy box up the stairs. Martin struggled to pay his bills, because he lost all his money on the bus. The chick struggled to emerge from the cracked egg.
She struggled to complete the marathon, but with determination and perseverance, she crossed the finish line.
With his friends encumbering him, Brian struggled to climb the stairs. With his friends encumbering him, Brian struggled to climb the stairs.
He struggled with all his might against the tide.
The mentor observed his pupil as he struggled with the problem.
Jane Addams struggled for democracy.
As the SYF, School exams and the RAD examinations were coming, Min Min struggled to keep up with her busy schedule.
Bill struggled for many years so that he could actualize his dream.
The freezing wind chafed our faces as we struggled through the storm.
To capitulate is to surrender. An example sentence would be: He had no choice but to capitulate when the police showed up.
To use the word "dull" in a sentence, you could say: "The lecture was so dull that I struggled to stay awake."