Question

Fill in the blank with a suitable option:
If they stand up, we _______________ see the screen.

• A. doesn't
• B. won't be able to
• C. haven't to
• D. aren't

Answer 1

Answer: (B)

won't be able to

The given sentence is a Type 1 conditional, because it presents a possible condition (if-clause) and its probable result.

In such sentences, the if-clause is in simple present tense and the main clause is in the simple future tense ('we won't be able to see the screen').

Option B: 'Won't be able to' is in the simple future tense. It completes the sentence in meaning as well as agrees with the Type 1 structure. Hence option B is correct.

Option A: 'Doesn't' is in the simple present tense. It isn't used in the main clause (but in if-clause).

Options C and D: Similarly, 'aren't' refers to the present tense. 'Haven't to' in this context is grammatically incorrect; especially when 'have' is an auxiliary verb (helping) and not the main verb (see).

Hence options A, C and D are incorrect.