ስንት?

No, 'sint' is invariant. It stays the same regardless of the gender of the person or object you are asking about.

Yes, 'Sint sew?' (How many person?) is the standard way to ask.

You can say 'ስንት ነው?' (Sint new?) or more politely 'ስንት ነው እባክዎን?' (Sint new ibakwon?).

'Sint' is for countable things or prices. 'Min yahil' is for 'how much' in an abstract or measurable sense (e.g., 'How much do you love me?').

Yes, generally it is considered private information in Ethiopia, much like in Western cultures.

Use 'Sint gize?' (Sint = how many, Gize = time/occasion).

Usually, you would use 'Min yahil rket new?' (How much distance is it?), but 'Sint kilo meter?' is also understood.

'Besint' means 'For how much' and is specifically used when you are suggesting a transaction or bargaining.

Use the ordinal form: 'Sintignaw lij neh?'.

Only in the context of time ('What time is it?') or date ('What is the date?'). Otherwise, use 'Min'.

Yes, very often! It's used to express 'how many' heartbreaks or 'how much' love.

Yes, 'Sint kilo?' is the standard way to ask for weight.

There is no plural form of 'sint'. It is always 'sint'.

You can say 'ጠቅላላው ስንት ነው?' (Teklallaw sint new?).