even
1.even是副词，不是连接词，如不可说Even you try again, you may not succeed。该在Even后面加上if。
2.even的位置往往影响全句的意思。例如：
- Even I have not heard of him for a year. （即使我也一年没有听到他的消息了。）
- I have not even heard of him for a year. （我一年来竟然也没有听到他的消息。）
- I have not heard of him even for a year. （我没有听到他的消息竟然有一年了。）
