The small second word that decides what a verb means
The two-part verbs a beginner meets in the very first week, and why the small word that follows the verb is never decoration.
Every morning I get up at six, turn on the radio and look for my shoes.
Each expression here is an ordinary verb followed by one small word - a particle, which is either an adverb or a preposition. The two words work as a single unit, and the small one carries much of the meaning. In the model sentence the first verb, used alone, would mean to obtain or receive something; with its particle it means to leave your bed. The second verb, used alone, would mean to rotate; with its particle it means to make a machine start working. Nothing in the verbs themselves predicts this. That is why such pairs are learnt as single items of vocabulary, exactly as you would learn any new word, and why they fill ordinary conversation.
The error to guard against is treating the small word as decoration and leaving it out - a habit of learners whose own language expresses the whole idea with a single verb. Stripped of its particle, the last verb in the model sentence means only to direct your eyes somewhere; it says nothing about searching. Replace that particle with another and the sense shifts again, to watching something happen, or to taking care of a person or an animal. The trap runs the other way with the machine verb in the middle: the two opposite particles it takes are the only thing separating starting the device from stopping it, so the wrong choice reverses your meaning while the sentence still sounds perfectly natural.