The sentence 'they are suitable' is correct and usable in written English. You can use this sentence when you want to suggest that something is appropriate for a particular purpose or situation. For example, "These chairs are suitable for my living room because they match the decor."
G.M. and Ford say they are suitable.
But they now worry if they are suitable.
"They are suitable for all but the most arctic conditions".
They are suitable for advanced glazing and other switching applications.
Hence they are suitable to immunize large communities or herds.
They are suitable for standard CMOS fabrication and analog systems.
Staff are bullied into selling financial products whether they are suitable for the customer or not.
Lasting three to four hours, they are suitable for all ages and the leaders speak English.
Private foster parents will be registered by local authorities to ensure they are suitable carers.
They are suitable for brazing nearly all steels and nonferrous metals except aluminum, magnesium, and titanium.
Accurate numerical results are given for different plate boundary conditions; they are suitable for engineering applications.
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu