Tiny questions with quick answers - continuing thread

[RichardBuck]

If you can say ‘whether’ instead of ‘if’, it’s a (or nothing) not os.
‘Please come if you can’ Dewch os medrwch (‘Please come *whether you can’ doesn’t work)
‘Do you know if he can come?’ Wyt ti’n gwybod (a) fydd o’n medru dod? (‘… whether he can come…’ is fine).

"Os" to mean whether or if

Technically, where the ‘if’ can be interchanged with ‘whether’, then it should be a e.g. I don’t know whether/if it will be fine tomorrow - Dwi ddim yn gwbod a fydd hi’n braf fory BUT you’ll hear os, being the primary Welsh word for if, and due to the influence of English, often being used in speech in both cases - where the if = whether and where it it doesn’t (in both N and S).