I have something to tell you(我有事想告诉你)如果你要用tell的话,就不能在you前再加to,tell somebody,而 talk, say 需要和 to somebody 来搭配,和某人谈话。根据你的要求就要用:something to talk,I have something to talk to you.I have something to say to you.
I want to talk with you.我想和你说话I have something to tell you.我想告诉你一些事I have something to share with you.我有些事(秘密)和你分享I want to have a word with you.我想和你说几句话(注意和下面这个句子的区别:I want to have words with you.我想和你吵架)
I have something to tell you.tell是及物动词后面要带宾语,不能直接接介词toI have sth to talk to you, 这个句式to talk to you是个宾语补足语I have sth to discuss with you,和上面一样to后面仍然是补充或描述sth的There's sth I want to tell you, 这是个表语从句。说法很多,需要灵活掌握,只要听得对话多了自然就会掌握了