Question

It is 10 o ' clock ______ my watch.

If the answer is BY, please explain me why.

Answer 1

yes the answer is by

so using by the sentence becomes it is 10 o'clock by my watch which means that the time according to my watch is 10o'clock.
we always use by in such sentence.

hope it helps and u get it....

Answer 2

It is 10 o ' clock (by) my watch.

• There are many prepositions that can place in this sentence but the meaning or the purpose will be changed.
• The preposition "by" represents time, the measurement of time.
• If we used "on" here it will be looking over someone or somebody
• This sentence is used when someone is asking for time.

• We have to be aware that any wrong preposition would change the sentence.