Both types of abstract must communicate ideas effectively, preferably with direct, active statements in short, simple sentences. There can be a difference in the use of verb tenses:
* use the present tense when you make general statements of fact, or say what your paper does (as in a descriptive abstract)
* use the past tense when you explain what you actually did or found out in your piece of research (as in an informative abstract)
The descriptive abstract will make more use of generalised vocabulary and phrases, while the informative abstract will have more precise, specific language, including numbers.
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