3. Tense, Aspect and Agreement
There are three aspects of morphology that must also be considered with reporting verbs, as with any verb. The first two are tense and aspect, such as whether to use the reporting verb in the present or past tense or simple, progressive or perfect aspect. Generally here, the following quick rules for the three most common tense/aspect combinations can be followed:
a) Use the simple present to describe a generally accepted truth, whether in the past, present or future: “Smith (2010) discusses how air pollution is harmful for a person’s health”.
b) Use the simple past to describe a finding or piece of research that was completed at a specific point in the past, and for evidence that’s quite old or has perhaps already been refuted by other research: “Hofman (1966) argued that air pollution had little effect on a person’s health.”
c) Use the present perfect to include a finding that occurred at an uncertain time in the past and which is still relevant today: Lee and Lee’s (2016) research has highlighted to many scholars that air pollution is a bigger threat than first assumed.”
In addition to tense and aspect, don’t forget to correctly inflect a reporting verb for correct subject-verb agreement. For example, while it might be correct to say ‘Lee (2016) states’, for ‘Lee and Lee (2016)’ the verb would need to be ‘state’.
4. Premodification and Collocation
To further alter the argumentative strength of a reporting verb, you can also premodify that verb with a number of adverbs such as ‘clearly’, ‘strongly’ or ‘somewhat’, as in the following examples: