chinese grammar

Question 1

between adverb and adjective which one can be repeated?

Answer 1

adverb cannot be repeated, while adjective can, however you can make adverb with adjective + 地， for example 快快地跑 （run fastly)

Question 2

睡觉 can be used to say something like “sleeping late” by saying
睡了个懒觉
This is an example of separable verb into a sentence

Answer 2

v + adj + o

https://chinese.stackexchange.com/questions/10388/what-can-be-included-in-between-a-separable-verb

Question 3

所以

Answer 3

所以 means “and so”

remember this doesn’t mean just “so”

Question 4

When does time modifier can be placed on a sentence

Answer 4

Right at the beginning or directly after subject, no other place can be used by time modifier, not like english that may be placed at the end.
昨天 我 去 了 酒吧 。
我 昨天 去 了 酒吧 。

Question 5

is time modifier adverb or adjective?

Answer 5

It is a special concept outside of adverb and adjective. Theoretically it is both adverb and adjective at the same time, modifying the whole sentence at the same time.
This is also the case with place modifier, as it provides context instead of just modifying one part of the sentence