verb-subject sentences

For many students it's easier to learn the grammar and to put/string together an English sentence than it is to speak the language.  Like everything, all you need is practice, which in turns builds confidence.  Now let's take a look a the basic English sentence.

The basic English sentence has a subject followed by a verb.  This is the common way in which they are written!  For example:  The man [subject] is tall [verb].
The president of the United States [subject] is smart [verb].

However, in some sentences the verb comes before the subject; for example:  There is [verb] a lawn mower [subject] in the street!
We are [verb] the cookie monsters [subject].