An adjective can be in the positive degree, comparative degree or superlative degree. The positive is the basic form of an adjective. The comparative expresses a higher degree than that is expressed by the positive and the superlative expresses the highest degree.

Case shows the relation between a noun/pronoun and some other word in the sentence.

A noun or pronoun can be in:

Read the sentences given below:

John gave me a present.
Gandhi taught us the doctrine of non-violence.

In the sentences given above the verbs have two objects each – one direct object and another indirect object.

As and Like

As is a conjunction. It is used to connect two clauses or words of the same grammatical class. Like is a preposition. It is used to show the relationship between a noun/pronoun and some other word in the sentence. Note that like is used before a noun or pronoun.

A verb must be of the same number and person as its subject.

Read the sentences given below:

He likes coffee.
They like coffee.

Some relative clauses identify the nouns they stand for: they tell us which person or thing, or what kind of person or thing is meant. In grammar, these clauses are called defining or restrictive or identifying relative clauses.

Who, whom and whose
We have seen that the relative pronouns who, whom and whose are generally used only for persons. Occasionally they are also used to denote animals and some inanimate things.