Let's assume you're translating a sentence. You can translate everything in English but sometimes there are idioms and phrasal verbs that you can use to make your sentnce more clear and compact. e.g., for this sentence:
I want to seperate it into pieces.
You can use "break up". i.e.,
I want to break it up.
But the point is that finding such phrasal verbs is difficult. I mean you don't know if such phrasal verb exist or how to search to find such phrasal verb. You non-native, How do you know that if such phrasal verb exist? How do you find them?
For example, I use https://www.thefreedictionary.com/break to find the meaning of phrasal verbs but it appears that we cannot use it in reverse direction as I said. Do you use any specific dictionary?