Choose the most suitable option to replace the highlighted part of the sentence:
My sister do not knows how to react to her friend's rude behaviour.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. does not know.
Context: The sentence describes the sister’s lack of knowledge about how to respond.
Grammatical concept:
- For singular subjects like My sister, we use does not + base verb (do-support rule).
- Also, “knows” cannot follow “do/does.”
Analysis of the given options:
-
do not knew – Incorrect (wrong tense + wrong auxiliary).
-
does not know – Correct subject-verb-auxiliary agreement.
-
is not knowing – Incorrect; “know” is a stative verb not used in continuous form.
-
do not know – Incorrect for singular subject “sister”.
Correct word/phrase: does not know
Final sentence: My sister does not know how to react to her friend's rude behaviour.
Hence, the chosen option is correct.