Foundation
English
Verb
Tenses
Question
I'm sure you will have a wonderful time but I ____8___ give you a word of warning.
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Solution
Option C is the correct answer because 'should' is the past tense of shall which is used to make offers, give suggestions and give advice, as in this case, the speaker advises him by giving him a warning.
Option B is incorrect because 'would' is the past tense of 'will', which is used to refer to things that are going to happen in the future.
Option A and D are incorrect because 'may' and 'can' here express possibility, whereas he is already giving the warning, so it is not a possibility.