お伺いしたいことがあるんですが

N5 たい tai want to do

N2 伺 shi / ukaga.u pay respects, visit, ask

N3 〜ことがある koto ga aru Indicates past experience or occasional occurrence, attaches to a verb, means have done before or sometimes happens N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N4 〜ので node Indicates cause or reason in a softer way than kara, connects two clauses, often used in polite explanations N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context N5 〜たい tai Indicates speaker desire to perform an action, attaches to verb stem, equivalent to want to do something N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜が ga Marks the grammatical subject, highlights new information, can also show slight contrast in some sentences N5 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements