Prepositions are of five different kinds:

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

Simple Prepositions

The present perfect continuous tense is used to talk about an action that started in the past, has continued up to the present and is still continuing.
Structure: Subject + has/have + been + -ing form of the verb + object/complement/adverbials etc.

Common Errors with the Present present tense

‘Where is Alice?’ ‘She has been to the market.’ (Wrong)
She has gone to the market. (Right)

Explanation

The present perfect tense is used to represent an action which has been completed within a period of time that extends up to the present. The present perfect tense can also be used to talk about actions which cannot be attributed to a definite point of time.

By adding –ly to an adjective:

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

Adverbs which are used for asking questions are called interrogative adverbs. There are several different kinds of interrogative adverbs.

Interrogative Adverbs of Time

Examples are: when, how long, how early, how soon etc.

There are three kinds of adverbs – Simple, Interrogative and Relative. The vast majority of adverbs belong to the first group; there are very few adverbs of the second and third types.