English grammar is the way in which meanings are encoded into wordings in the English language. This includes the structure of words, phrases, clauses, and sentences, right up to the structure of whole paragraphs. Eight parts of speech are commonly distinguished in English: nouns, determiners, pronouns, verbs, adjectives, adverbs, prepositions, and conjunctions.
This tense is used when the action is continuing over a particular time in the present. It is different from simple present as the actions in simple present occur regularly over a period of time, but actions in the present progressive continue to happen in only a specifically mentioned time.
Present perfect tense is used when an action that started in the later past and completed in the recent past, influences some action in the present. In these cases, the verbs are mentioned in past participle form, and “have” with “I, you, we, they” and “has” with “he, she, it” and related nouns.
Present perfect progressive is used when an action that started in the past continues even in the present. We use "have been + <verb+ing>" for "I, we, you, they" and related nouns. These sentences use "has been + <verb+ing> for "he, she, it" and related nouns. In addition to that, the verb used in "has/have/had been" structure is always used with "ing" as the action is supposed to be continuing.
Conditionals are used when an action has the possibility of occurring only when another condition if fulfilled. These statements are generally framed as “if… then” statements”. The “if statement” is considered the conditional clause, and the “then” statement is considered the main clause.
A Pronoun is a word used instead of a Noun. Using a proper noun each time, you wish to talk about a person, place or thing. This can make the conversation or piece of writing very boring and repetitive. To avoid this monotony, we use pronouns in place of nouns. These words make the writing crisp.