1. search sb.：认真搜查某人身体
e.g. They searched him but nothing was found on him.
search for sb.：搜查某地为找到某人
e.g. They searched for him everywhere but failed.
2. settle down：落下;定居
e.g. The dust slowly settled down.
He has settled down in the countryside.
settle down to：专心致力于;逐渐习惯于
e.g. He settled down to his homework.
They settled down to a new job.
3. speak for itself：不言而喻
e.g. One does not to be told that this fact speaks for itself.
speak for oneself：发表本人的意见
e.g. What others think I do not know, I can only speak for myself.
4. submit to：屈服于
e.g. He has to submit to an operation.
submit…to：提交
e.g. They must submit the case to the court.
