There’s a sentence ‘He said that she’d better try to speak a little more slowly’ (09:51) which I was expecting to be ‘Dweddodd e bod well iddi hi drio siarad bach yn arafach’ but it sounds like ‘Dwedodd e byddai’n well iddi hi drio siarad bach yn arafach’
Please could someone explain why this is?
This is one of those situations where the way we say something in English is rather odd - and the Welsh is more logical - there are a few of these around future and conditional tenses, where in English we use another tense.
The Welsh is literally:
He said it would be better for her to speak a little more slowly.
Which seems very sensible. English is my first language but I find the English - she’d better - harder to justify - it is commonly used but idiomatic I think.
Rich 
Diolch for the explanation 