Read the given sentences carefully and choose the grammatically correct sentence.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → She is the prettiest girl I have ever seen.
Superlative degree of a short adjective:
- A short adjective such as pretty forms its degrees with -er and -est: pretty → prettier → prettiest (the y changes to i).
- More and most are used with longer adjectives (more beautiful, most beautiful); they never come together with -er or -est.
- "The ... I have ever seen" compares one girl with every girl the speaker has seen, so it needs the superlative: the prettiest girl.
Example: This is the tallest building I have ever seen.
Why the Other Options are Incorrect?
Option 1: She is the most prettiest girl I have ever seen. — Incorrect. "Most prettiest" is a double superlative; the ending -est already does the work of "most".
Option 2: She is certainly the pretty girl I have ever seen. — Incorrect. "The ... I have ever seen" needs the superlative; the positive form "pretty" makes no comparison.
Option 4: She is the more prettier girl than another girl I have ever seen. — Incorrect.
- "More prettier" is a double comparative; the comparative is "prettier".
- A comparison with every girl the speaker has seen needs the superlative, not a comparative with "than another girl".
Contrast: a short adjective takes -est (prettiest) and a long one takes most (most beautiful); the two never come together, so "most prettiest" is wrong.