Відповідь:

1, 2, 3) Countable

Пояснення:

1)Yes, “sun” is a countable noun. There are many suns in the galaxy and universe, and it is even possible to have a binary solar system, meaning it has two suns.

2)The word 'knowledge' is a non- countable noun because : It can be counted as one knowledge, two knowledge, three knowledge etc. It does not have a plural form (knowledges)

3) Один из переводов, это бетон, или конкретный предмет. Поэтому скорее всего countable