Did you have any difficulty in learning English last year为什么difficulty在这句话中有时复数又是单数?到底怎么回事啊?

Did you have any trouble finding us? Did you have any trouble finding us? Did you have any dogs growing up翻译谢谢 Did you have any trouble __(find)the post office. unclogging reagent是什么意思Did you have any luck?整句话是in regards to the unclogging reagent,did you have any luck? did you have any ___________when you were a kid?yes,I had a rabbit. Why did you choose your major?Do you have any regrets? Did you have any trouble with your Chinese when you were in China 翻译成中文 Did you have any trouble with your Chinese when you were in China中文 did you take any pictures? do you have any. Do you have any when you have any Have you any inventions? 连词成句did,have,any,your,English,you,difficulties,in did,have,any,your,English,you,difficulties,in,)中文也要有 连词成句：did,have,any,your,english,you,difficuties,in. 连成句子1.did,have,any,your,English,you,diffculties,in（?）