Question

Use the appropriate word:- You should know______ to talk and ______ to keep your mouth shut", the teacher advised anil.​

Answer 1

Answer:

You should know when to talk and when to keep your mouth shut," the teacher advised Anil.

Answer 2

The answers in the blank are both when.

• This is a direct voice in the simple present test where the teacher is advising Anil.
• Hence one should know when to talk is the correct sentence
• And for the second blank, again When to keep your mouth shut is the correct sentence.

Hence the answer is, " You should know when to talk and when to keep your mouth shut", the teacher advised Anil.

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