How do you spell "from under"?

Prepositions are the official part of speech. What does this mean? And the fact that their value is auxiliary, that is, they help determine the ratio of different parts of speech to each other. However, the writing of prepositions is often difficult. And how is it written "from under"?

The main thing that should be understood is that"From under" is written only through a hyphen. This is an established form, and not a combination of two prepositions "from" and "under." In another way, this preposition is not used. Just like the prepositions "over", "because of".

Any preposition is used with some indirectwith a case. The preposition "from under" is always applied only with the genitive case, answering the questions "who? What? ". For example: "I got out of bed."