非常感谢刘老师再次给予题目解答！下面是我的解答，如果解答不好，还望批评指正，谢谢大家！向大家请教学习！

【1】以下是介词”to” 不定式“to”共计10个的复合句

Mary decided① to make a plan ②to learn English in order ③to learn English well and chat with some foreigners who have the same hobbies with her,which caused her parents ④to feel a little worried about her owing ⑤to the reason that they are afraid that she was tempted ⑥to do something bad and her parents told this ⑦to her and reminded her ⑧to be careful while she was communicating with foreigners and she agreed⑨ to accept their advice which was given ⑩to her in the end.

【2】关于10个to 的解析如下

【1】不定式 decide to do sth 决定做某事

【2】不定式a plan to to do sth 一个做某事的计划

【3】不定式 in order to do sth 为了做某事

【4】不定式cause sb to do sth 引起某人做某事

【5】介词owing to  由于某事

【6】不定式be tempted to do sth被诱使做某事

【7】介词tell sth to sb 把某事告诉某人

【8】不定式remind sb to be+adj. 提醒某人要...

【9】不定式agree to do sth 同意做某事

【10】介词sth be give to sb 某事被给某人

【3】以上复合句翻译如下

【参考译文】玛丽制定了一个学习英语的计划以便于能学好英语并和她具有相同爱好的外国人聊天。这使得她父母有点担心她因为他们担心她会被诱使去做一些坏的事情,她父母把这个事情告诉了她并提醒她在与外国人谈话的时候要小心一点最后她同意接受他父母给她的建议。

【句子】I want (1) to write a letter (2) to him telling him that if he wants (3) to speak English (4) to an Englishman fluently, he has (5) to listen (6) to the English broadcast from morning (7) to night, or often talk (8) to an Eglishman who is willing (9) to help him (10) to learn English.

【译文】我想给他写一封信，告诉他如果他想要流利地对英国人讲英语，他必须从早到晚听英语广播或者经常和乐意帮助他学英语的英国人交谈。

【分析】 

(1) to 是不定式符号：want to do sth. 想要做某事 

(2) to 是介词：write a letter to sb. 给某人写信

(3) to 是不定式符号：want to do sth. 想要做某事 

(4) to 是介词：spesk English to sb.对某人讲英语 

(5) to 是不定式符号：have to do sth. 不得不做某事，必须做某事 

(6) to 是介词：listen to ... 听...... 

(7) to 是介词：from morning to night从早到晚

(8) to 是介词：talk to sb. 和某人交谈

(9) to 是不定式符号：be willing to do sth 乐意做某事 

(10) to 是不定式符号：help sb. to do sth. 

(11) 全句是一个简单句： I 是主语，want 是及物动词作谓语，to write a letter to him 是动词不定式短语，作want 的宾语。从telling 到末尾是现在分词短语作状语：him 是 telling 的间接宾语，if he wants (3)to speak English (4)to an Englishman fluently, he has (5)to listen (6)to the English broadcast from morning (7)to night, or often talk (8)to an Eglishman who is willing (9)to help him (10)to learn English 是一个复合句作 telling 的直接宾语（if he wants (3)to speak English (4)to an Englishman fluently, 是条件状语从句， he has (5)to listen (6)to the English broadcast from morning (7)to night, or often talk (8)to an Eglishman who is willing (9)to help him (10)to learn English 是主句）。