What is the most common use of must and most in written English?

The most common use of «must» in written English is to indicate a strong obligation or a rule that must be followed. 1 It is often used in formal writing, instructions, and rules. 1 For example: «I must finish my homework before I can go out to play». 1

The most common use of «most» is to compare or describe the highest degree or amount of something. 1 It is used when talking about a majority or a large part of a group. 1 For example: «Most people enjoy going to the beach during the summer». 1

Таким образом, «must» используется для выражения требования или необходимости, а «most» — для описания большинства или наибольшей части чего-либо. 2