Several problems about weather units in English grammar of Grade One in junior high school

Snowing is the progressive tense of the verb snow.

Snow is the adjectives snow and snow.

It is snowing now. It is snowing now. Both mean it's snowing now.

Now is a sign of present progress, which is relative to verbs. Adjectives are used to express state, verbs are used to express action, and the meaning is the same.

Is the pronoun 1. (of people or things mentioned or thought of) This, that, it 2. (refers to inanimate objects, animals and plants, children of unknown sex, etc. )It 3。 As the subject of impersonal verbs, it indicates time, climate, distance, etc. (put at the beginning of a sentence or lead to the next phrase or clause) 5.