Besides the changes in the tenses and the pronouns, words expressing nearness in direct speech are changed into words expressing distance in indirect speech. The rules are as follows:

Frequency adverbs tell how often something happens. Examples are: often, never, always, sometimes, generally, usually, seldom, rarely, hardly, ever, frequently etc.

Position of Frequency Adverbs

There are several words which are used both as adjectives and as adverbs.
Some adjectives formed by adding –ly to nouns are also used as adverbs.

Adverbs, like adjectives, have three degrees of comparison – the positive, the comparative and the superlative. The different degrees of comparison are formed in different ways:

Adverbs should come as near as possible to the verbs they qualify. This is because the meaning of a sentence can change with the change in the position of the adverb.

Prepositions are of five different kinds:

1.    Simple prepositions
2.    Compound prepositions
3.    Double prepositions
4.    Participle prepositions
5.    Phrase prepositions

Simple Prepositions

By adding –ly to an adjective:

Strange, strangely; brave, bravely; beautiful, beautifully; able, ably; cheerful, cheerfully; modest, modestly; probable, probably; selfish, selfishly; vigorous, vigorously