Grammar
Cleft sentence ( It was yesterday that…)
The construction It is… that is known as a cleft sentence, and it is often used to emphasize a specific part of a sentence.
Cleft sentences are typically formed by splitting a sentence into two parts: the clause before it is and the clause after that.
Here’s the basic structure of a cleft sentence: It is [clause before it is] that [clause after that].
Subject of a Sentence. Types for definition
The subject is the part of the sentence that typically indicates who or what the sentence is about.
The subject of a sentence can answer the questions who? and what?
It can be expressed using various forms, including nouns, pronouns, infinitives, gerunds, numerals, and other words or combinations that function as nouns.