commit vt．犯（罪、錯），干（壞事）
commit a crime 犯罪(to do sth. against the law)
A:Why are you so sure that Anne didn't commit the crime?
你憑什么如此肯定安妮沒有犯罪呢？
B:She couldn't have committed that crime because I was with her. And we were out of town that day.
她不可能犯罪，因為當(dāng)時我和她在一起，而且我們那天出城去了。
commit suicide 自殺(take one's own life, kill oneself)
例句：It is difficult to describe what kind of people tend to commit suicide.
很難描述哪一種人容易自殺。