The phrase "are often useful" is correct and usable in written English.
It can be used to describe something that frequently provides benefit or assistance in various contexts.
Example: "These tools are often useful for improving productivity in the workplace."
Alternatives: "are frequently helpful" or "tend to be beneficial."
When we go to museums we're given a lot of facts about things – their dates, materials, subject matter (if any), the cultures that produced them and so on – and these specifics are often useful in helping us grasp the basics of what we're looking at.
Although the specificity of cCTA is limited by arterial calcification, post-processing techniques using vessel tracking and curved multiplanar reconstructions are often useful for evaluation of calcified vessels (Fig. 5).
Because trends in abundance are often useful for management, we desired performance metrics that would allow us to separately evaluate 1) the model's ability to return the correct overall abundance scale, and 2) the model's ability to accurately portray changes in abundance.
As for the label itself, Patten says, "it took me ages to realise labels are often useful things".
Variations in tract width and length and especially differences in feather number and distribution are often useful in determining relationships.
But therein lies a drawback: macros are often useful only to the person who has set them up and knows how they work.
Guided imagery, meditation, relaxation therapy and hypnosis or hypnotherapy are often useful adjuncts to pain treatment, because they can reduce stress and take one's mind off the pain.
This first approach isn't necessarily problematic – the peer-review process is necessary but imperfect, and in fact contrary hypotheses are often useful scientific contributions.
Look for magazines, journals, websites and blogs that are relevant - professional bodies are often useful to find materials, as is your university library.
Second, they like markets, and markets are often useful in implementing policy.Commentary on Sir Nicholas Stern's review of climate change has focused mostly on the first tendency.
Cliches are often useful tidbits of wisdom imparted too often to have any remaining emotional impact: "live every day as though it is your last" being a prime example.
