WAEC - English Language (2018 - No. 60)
From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences.
I know it's a secret, so I _____ tell anyone.
couldn't
shan't
needn't
mightn't
설명
"shan't" is the contraction for "shall not" and this is the modal verb used here because part of secret-keeping is the obligation not to tell anyone otherwise it is not longer a secret. The other modal verbs - "couldn't", "needn't" and "mightn't" - do not reflect the obligation. They do not show that it is compulsory to not tell anyone.