Writing complaint letter

Each house on the street has a different number.

We use EACH because we consider each house individually, one by one. This house has a different number and this house has a different number and this house and this house etc. they have a different number.
Each is used when we consider them individually, one by one.

Relative pronouns and relative clauses

Level: beginner
The relative pronouns are:

Subject	Object	Possessive
who	who/whom	whose
which	which	whose
that	that	-

We use relative pronouns to introduce relative clauses. Relative clauses tell us more about people and things:
Lord Thompson, who is 76, has just retired.
This is the house which Jack built.
Marie Curie is the woman that discovered radium.
We use:

• 
  who and whom for people
  
• 
  which for things
  
• 
  that for people or things.
  

Adjectives
An adjective (abbreviated adj.) is a word that describes or defines a noun or noun phrase. Its semantic role is to change information given by the noun.
Traditionally, adjectives were considered one of the main parts of speech of the English language, although historically they were classed together with nouns.^[1] Nowadays, certain words that usually had been classified as adjectives, including the, this, my, etc., typically are classed separately, as determiners.Here are some examples:

• 
  That's a funny idea. (attributive)
  
• 
  That idea is funny. (predicative)
  
• 
  Tell me something funny. (postpositive)
  
• 
  The good, the bad, and the funny. (substantive)
  

Etymology[edit]

See also: Part of speech § History, and Noun § History
Adjective comes from Latin nōmen adjectīvum,^[2] a calque of Ancient Greek: ἐπίθετον ὄνομα (surname), romanized: epítheton ónoma, lit. 'additional noun' (whence also English epithet).^[3][4] In the grammatical tradition of Latin and Greek, because adjectives were inflected for gender, number, and case like nouns (a process called declension), they were considered a type of noun. The words that are today typically called nouns were then called substantive nouns (nōmen substantīvum).^[5] The terms noun substantive and noun adjective were formerly used in English but are now obsolete.^[1]

Types of use[edit]

Depending on the language, an adjective can precede a corresponding noun on a prepositive basis or it can follow a corresponding noun on a postpositive basis. Structural, contextual, and style considerations can impinge on the pre-or post-position of an adjective in a given instance of its occurrence. In English, occurrences of adjectives generally can be classified into one of three categories:

1.