Transform the below sentence by replacing the word-"if" with the most appropriate word:
If you see him again in this building, please inform the security immediately.
Transform the below sentence by replacing the word-"if" with the most appropriate word:
If you see him again in this building, please inform the security immediately.
The correct option is B Should you see him again in this building, please inform the security immediately.
'If' is a conjunction which is used to express uncertainty about whether an action (or event or condition) will occur. In the event, the particular action (or event or condition) occurs, then the other event is likely to occur. Option A: The auxiliary verb, 'had' can be used to replace the word 'if' in a conditional sentence, only if it is in the past tense. The given sentence is a condition in the future tense. Hence, 'had' cannot be used and option A is incorrect.
Option B: The modal, 'should' is used in a conditional sentence in the present tense with a future meaning. It is used in conditional sentences mainly to either give advice/recommendation/talk about an obligation/talk about something which is probable/expected. The clause, 'If you see him again in this building' can be replaced by 'Should you see him again in the building'. Hence Option B is correct.
Option C: A conditional sentence can begin with the auxiliary, 'were' when the original sentence (starting with 'If') has 'were' as the linking verb (which acts as the main verb). In the given sentence, 'were' does not appear. Hence, this option is incorrect.
Option D: The word, 'unless' is used to replace 'If... not'. In the given sentence, the word, 'not' isn't used. Hence, this option is incorrect.
Option B: The modal, 'should' is used in a conditional sentence in the present tense with a future meaning. It is used in conditional sentences mainly to either give advice/recommendation/talk about an obligation/talk about something which is probable/expected. The clause, 'If you see him again in this building' can be replaced by 'Should you see him again in the building'. Hence Option B is correct.
Option C: A conditional sentence can begin with the auxiliary, 'were' when the original sentence (starting with 'If') has 'were' as the linking verb (which acts as the main verb). In the given sentence, 'were' does not appear. Hence, this option is incorrect.
Option D: The word, 'unless' is used to replace 'If... not'. In the given sentence, the word, 'not' isn't used. Hence, this option is incorrect.
