The sentence "has been extremely useful" is grammatically correct and can be used in written English.
You can use this phrase to express that something was extremely helpful or valuable, or to point out how beneficial a situation or tool has been. Example: The online tutorial I attended last week has been extremely useful in helping me to understand the concepts behind machine learning.
However, although CIA in DBA/1 mice has been extremely useful for testing drugs with anti-inflammatory properties, its usefulness for assessing T cell-targeted therapies is limited to some extent by the relatively acute nature of the disease.
The use of rRNA sequences for identification and classification of organisms has been extremely useful for 40 years (Case et al. 2007; Rinke et al. 2013).
The Leopold program has been "extremely useful," he said.
"I've had the opportunity to work in different areas of the business and that has been extremely useful.
Sen told me he thinks the index has been extremely useful for tracking the progress of the world's poorer nations.
Gertrude Rossbacher, a viola player with the Tonkünstler, thinks that the exercise has been extremely useful for the composer/conductors: "Very different from sitting at a table and just writing the music .The composers, too, have found the experience invaluable.
Nevertheless, despite the indiscriminate nature of these perturbants, they have been extremely useful in allowing us to discover and study these fundamental stress response pathways.
But Arnie has now stepped up to let us into a vital secret that might have been extremely useful to John Connor and his army of human freedom-fighters in their resistance campaign against the machines.
The use of rice, sorghum, maize, and Brachypodium genome sequences have been extremely useful for synteny based applications and identification of shared genes and traits [ 31].
Over- and under-expression of proteins using transgenic, gene-targeted mice and natural mutant mice have been extremely useful in exploring the pathogenesis of COPD (D'Armiento et al, 1992; Shipley et al, 1996).
Micro-satellite markers have been extremely useful in mapping causal genetic variants in family pedigrees and have been successfully used to identify high-penetrance genes, as in the case of BRCA1 [ 4].
