"The bananas are small."
Translation:केले छोटे हैं।
The definite article 'the' in 'The bananas are small' is telling us that we are talking about a particular set of bananas.
On the other hand, होते in 'केले छोटे होते हैं' would make it a general statement about all bananas. So, it would more accurately be translated as 'Bananas are small'.