Is the following sentence correct please?
I am worry that however secure the fixing, flopping noise my be generated when come the windy days.
'The windy days' could be a mistake. The more common possibilities are:
come windy days - on days like that
on a windy day - on a day like that
But I didn't change it in your example because it might mean 'on the days like that, which always happen at a certain time of year in this part of the world'.
*PS In brief, my view is that there are only a handful of verbs that can denote modality by using a verbal inflexion; examples are 'come', 'do', 'be', 'have', and inflected forms of those verbs - 'Come tomorrow, things will be different', 'Did they but have eyes to see, they would know that...', 'Were he the son of a King, I would still call him a fool', 'Had I but the time, I would ...'.
But with most verbs this doesn't work: Read I it in The Times, I would believe it.'
Note: Am English is much more protective of the subjunctive than Br English. For more of this discussion, there are many threads where it's been flogged to death; this search will be a start: UsingEnglish.com ESL Forum - Search Results