It is important to use the correct adverbs of frequency in order to produce a clear essay in the IELTS exam. Different levels of adverbs provide different profiles to the sentence.
For example:
- The applicants are usually invited to the interview
- The applicants are sometimes invited to the interview
With the first sentence, the applicants are most likely invited to the interview. They can expect to be invited, unless they fall into the specific and unusual conditions.
Whereas, the second sentence indicates that the students could be invited to the interview. However, the possibility is uncertain from time to time.
In fact, it is difficult for non-English natives to distinguish the slight nuanced differences among those adverbs and use them applicably. The below picture shows the level of adverbs of frequency in percentage will help you to enhance understanding.

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