Phrasal verb Fritter away
I frittered away so much money on my sister with the hope that she will study well. But, all my hopes were dashed away as she failed in her intermediate examination.
It is not wise to fritter money and time away without any purpose and goal.
In order to get a good rank, students should not fritter away their valuable time.
please correct if any mistakes in the usage or grammar
All of these sentences are correct.
the usage is fine, and the grammar also
The usage and grammar in the sentences you provided are correct. However, I would suggest a small clarification for the third sentence:
"In order to achieve a good rank, students should not fritter away their valuable time."
This phrasal verb "fritter away" means to waste or squander something, usually money, time, or resources, in an aimless or frivolous manner. It implies using something inefficiently or without regard for its value.
To answer your question about correcting mistakes, there are a few potential improvements you could make to enhance these sentences:
1. "Phrasal verb fritter away" should be written as "The phrasal verb 'fritter away'." It is more grammatically correct to include the definite article "the" before the phrase.
2. In the second sentence, instead of saying "But, all my hopes were dashed away," you can remove the word "away" because it is redundant. The sentence would then read: "But all my hopes were dashed as she failed in her intermediate examination."
Overall, your understanding and usage of the phrasal verb "fritter away" is accurate, and these sentences effectively illustrate its meaning.