Statements

A statement is a sentence whose purpose is primarily to convey information. It usually has two criteria:

1) The clause contains a subject. 

2) The subject precedes the verb. 

These sentences are said to have a declarative structure. 

In conversation, the subject is often omitted from a declarative sentence:

Looks like snow. Told you so. Beg pardon. 

There are a very few cases where the subject follows a verb. This happens when the clause begins with words like 'hardly' and 'scarcely', which express a negative meaning. 

Hardly had he left, when the heavens opened.