advice, information, experience, feedback, quality, condition
In English, as opposed to other languages, words such as advice and information do not take the plural ‘s’ forms; other words change their meaning depending if they are countable or uncountable. For example:
[Uncountable] He has long experience in the field of accounting. (=dt Erfahrung)
[Countable] I had some bad experiences with fireworks once. (=dt Erlebnisse)
[U] We aim to provide quality at reasonable prices
[C] It’s hard to find people with the right qualities for the job.
[U] be in bad / good / excellent condition * a used car in perfect condition
[pl] living / housing / working conditions * changing economic conditions * a strike to improve pay and conditions