"The word which expresses frequency or how often something occurs is called 'adverb of frequency'."

Adverbs of frequency are always placed before noun.. (The test question is How often?).

» The test question 'How often?' : I come here frequently.

• There are two types of Adverbs of frequency:

1. Adverbs of definite frequency,

2. Adverbs of indefinite frequency.

Adverbs of definite frequency, are terms that labels definite frequency or express any exact number of times that happen in a given time period. Adverbs of definite frequency usually placed at the end of the sentence.

Adverbs of indefinite frequency, are terms that have an unclear meaning as to how long are how often something occurs. These adverbs usually placed after the main verb or between the auxiliary verb and infinitive.