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Adjectives and Adverbs

Adjectives
Adjectives fall into two categories : descriptive and limiting. Descriptive adjectives are those which describe the color, size, or quality of a person or thing (noun or pronoun). Limiting adjectives place restrictions on the words they modify (quantity, distance, possession, etc).
Note : only these and those are plural forms. All others remain the same whether the noun is singular or plural.
When descriptive adjectives modify a singular countable noun, they are usually proceded by a, an, or the.
Example :
- a pretty girl
- an interesting story
- the red dress

Adverbs
Adverbs modify verbs (except linking verbs), adjectives, or other adverbs. Many descriptive adjectives can be changed to adverbs by adding -ly to the adjective base.
Note : the following words are also adverbs ; so, very, almost, soon, often, fast, rather, well, there, too. An adverb answers the question : How..?
Example :
- John is reading carefully. (How is John reading?)

Modal Auxiliaries
The modal auxiliaries have a number of different meanings. They are generally used to indicate something which is potential or uncertain. Remember that a modal is an auxiliary, and thus is never used with do, does, or did.

Conditional Sentences
The modals will, would, can, and could often appear in conditional sentences. Usually conditional sentences contain the word if. There are two types conditionals : te real (factual and habitual) and the unreal (contrary to fact or hypothrtical). The real, or "future possible" as it is sometimes called, is used when the speaker expresses an action or situation which usually occurs, or will occur if the circumstances in the main clause are met.