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.

When the subject is a clause

When the subject is a clause, the sentence usually begins with it. So instead of saying ‘That he was once a communist is true’, we say, ‘It is true that he was once a communist’.

When the subjective is an infinitive phrase

We begin a sentence with it when the real subject is an infinitive phrase. So instead of saying, ‘To accept your advice is difficult’, we say, ‘It is difficult to accept your advice’.

The structure there + to be is very commonly used to say that something exists. There is normally an adverb of place. But the introductory there does not have any adverbial sense and is merely used to introduce the sentence.

The common types of relations indicated by the prepositions are that of place, time, manner, cause, reason, purpose, instrumentality, possession, contrast etc.

Prepositions of place