only is an English word with multiple meanings and usages:
1. As an adjective: single or solitary in number or kind
2. As an adverb: no more than; merely
3. As a conjunction: except that; but
4. In idioms: "only child", "only if", "only just"
5. In slang: used to emphasize uniqueness or specialness
only这个英文词儿可有意思了，用法老多了去了：
1. 当形容词用：表示"唯一的"、"仅有的"，比如"独生子女"叫"only child"
2. 当副词用：意思是"仅仅"、"只不过"，比如说"我就喝了一杯"就是"I drank only one cup"
3. 当连词用：表示"要不是"、"只是"，比如"I would go, only I'm too busy"就是"我倒是想去，就是太忙了"
4. 固定搭配：像"only if"表示"只有...才"，"only just"就是"刚刚好"的意思
5. 网络用语：现在年轻人爱说"only you"，就是"非你莫属"那个意思，倍儿浪漫
特别提醒：这个词儿放句子里位置不一样，意思可能就变了。比如说"Only I love you"和"I only love you"那意思可差远了去了！