You would use a different verb in the sense of turning off a computer. This is one peculiar aspect of the English language that non-native speakers have a hard time grasping. Split infinitives seem to have become accepted English usage. In other languages, the verb infinitive has a specific form that identifies it as such. The adverb would be used after the infinitive.
English syntax is very inflexible compared to other languages.
Other languages are much more flexible. For instance, in Spanish, Italian, or even Polish, you do not need to use the pronouns with the verb because the verb endings indicate the person. Then, of course, the syntax of German and Dutch is in a category of its own, with verbs coming at the end of sentences under certain circumstances. Many languages do not use articles. Virtually all Western European languages use articles.