The usage of 1 is:

The past tense of is is was. Is is a linking verb, also called a linking verb, which is used to assist the subject. It has its own meaning, but it cannot be used as a predicate alone. After that, it must form a systematic table structure to explain the status, nature and characteristics of the subject.

In English, the function of a copulative verb is mainly to connect the predicative with the subject and explain the nature, characteristics, personality or state of the subject.

2. the usage of 2.not:

The basic meaning of not is not, which is usually used in negative sentences, after verbs be, have, have or modal verbs, or together with them to form abbreviated forms, such as: no, don't, won't, etc.

Infinite forms of verbs that can be followed by not: infinitive, gerund or participle.

Extended data:

Keyword explanation:

1、it

Pronouns [referring to inanimate things, animals, plants] it; This; that

Pronouns refer to things, activities, experiences, abstract ideas, etc. What has been mentioned or will be mentioned.

Pronouns refer to gender or unknown situations.

Pronouns, as the subject of impersonal verbs, indicate weather, time, distance, state, temperature and so on.

Bilingual example:

Is it? It? Does it really matter? Who is it? Really? It?

Does it really matter who did it?

2. No.

Be negative, don't.

Not (logical operation in computer)

Bilingual example:

Isn't it? Everyone? Agreed. ?

Not everyone agrees.