We should use a linking verb between a subject and its complement in a sentence. The linking verbs,such as is, are, was, are. The subject's complements are nouns or adjectives which rename or describe the subjects. Every English sentence must include a verb.
e.g. We are the best students in this class.
Most Chinese in Canada are students.
In every English sentence, need include a subject. Sometimes the subject doesn't present in the sentence, but we can understand what the subject is.
e.g. Please turn up the music.
Don't smoking.
The word it is used as a subject in an English sentence.
e.g. It is a good movie.
It is a rainy day.
In most English sentence, the subject before the verb, but in some English sentence, the verb before the subject. We call this situation "expletive"(there or it).
e.g. There are many people in this building.
There is a cat in your bed.
In the inverted sentence, sometimes we use an infinitive(to do)or a noun clause(that he is friendly). The placeholder it is needed before the verb.
e.g. It is hard to finish my homework tonight.
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