HSK 6 HSK V5
Correct

不时

/ bùshí / 
Strokes

Definition

from time to time/now and then/occasionally/frequently

Example

As an Adverb

frequently; often; at intervals; from time to time; every now and then

1
Tā
她
bùshí
不时
lái
来
gěi
给
wǒ
我
zhǎo
找
diǎnr  
点儿
máfan
麻烦
  
。

She comes to bother me from time to time.

As an Adverb

any time