expresses a reason or cause, results in a conclusion / used to emphasize a certain point / used to explain a situation or circumstance

want to do

how old are you?

that's so, isn't it so? / hmm (used to indicate that the listener has heard and understood) / well (as a filler word particularly at the beginning of a response to a question)

It would be good if~

It's good / okay to... / is fine

I/he/she/they intend(s) to; plan to

I'm Jewish

how are you?

my deepest condolences; I am so sorry.