2016 · Q3
This is to certify that I know Mr. J. Mathews since 1970.
EnglishSentence Improvement
- Aam knowing
- Bhad known
- Chave known
- DNo improvement
Explanation
'Since 1970' marks a period continuing up to the present, so the present perfect is mandatory: 'I have known Mr. J. Mathews since 1970.' The simple present 'know' cannot pair with 'since'. 'Am knowing' (A) is doubly wrong because 'know' is a stative verb and is not used in continuous tenses. Hence the answer is C.