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同学好呀~
for example是插入语，可以插在句子的任意位置，甚至可以放在句子前面，而such as中such是后置形容词(of the same kind as that already mentioned or being mentioned)，所以只能跟在所修饰的主词后面。主词和such之间可以有逗号，也可以没有逗号。没有逗号是像...之类之意，与for example的“例如”意思相差甚远(见Such as前面要不要逗号？)。只有在主词和such之间加逗号的such as才有“例如”的意思。

在语义上, for example有“侧重于给例子让对方明白”的含义，而such as就只是让所修饰的主词丰富起来,例如
例句：Wear something simple, for example, a skirt and blouse. (通过举例让受众理解“穿简单”)。
例句： A lot of my friends were there, John and Linda, for example.
例句：Mary has many hobbies, such as swimming,bowling, and running.

也正因为上述语义的差异，for example可以放在句首，通过它后面的句子，帮助受众理解它之前的“整个句子”，而such as 只能在所修饰主词后面。
例句：My new roommate is awful. For example, she keeps using my toilet paper.
例句：Children should eat less junk food. For example, they should avoid eating burgers and chips.
例句：Children should avoid eating junk food, such as burgers and chips.

For example是侧重通过示例（更倾向于项目列表），让受众好理解，而for instance侧重给出一个佐证的案例(一个事件经过)。
例句：My pantry is stocked with mostly canned foods. For example, I have canned soups, beans, corn, and tuna, among others.
例句：I get the most embarrassed when I involuntarily make a sound in public. For instance, one time last week at the bank, I let a boisterous burp out, without even realizing that there was a crowd of people around me who could hear me.

祝学习愉快！