Today we will learn about whether "is" is a preposition or not.
First,you have to know the functions of a preposition.
A preposition is a part of speech which makes relationship a noun with another noun or adjective or verb.
●Noun +Preposition+Noun
●Adjective+Preposition+ Noun
●Intransitive Verb+Preposition+Noun
Look,after preposition we must have a noun.

Remember that we cannot use "is" as a preposition.But we can use the word "is" as a verb.
To know details,I request you to read the following text.
Is is the 3rd person singular of the present tense of be which is a verb.
Remember that the verb"be" has different forms depending on its subject and on its tense.
◆Present Tense
>>I am
>>It/She/He is
Is can be used in the following ways:
Way-1: Is can be used as auxiliary verb tenses or in passive voice or forms.
>>The car is leaving.
>>The glass is broken.
Way-2:We can use "is"as a verb(followed by an infinitive with ' to')
●She is to marry the man.
●All books are to be returned by Sunday.
Way-3:Is can be used as a linking verb(followed by an adjective or noun complement)
>>He is ill.
>>Her brother is a doctor.
Way-4: Is is often used in question tags.
>>It is very cold,isn't it?
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