My Grammar and I (Or Should That Be 'Me'?): Old-School Ways to Sharpen Your English

What kind of a sentence do you call that?
Many sentences simply make statements. The posh word for this is a declarative
sentence.  But  sentences  can  also  ask  questions,  give  instructions  or  make
exclamations:
A declarative sentence : I saw you copying the files.
An interrogative sentence : Did you copy the files?
An imperative sentence : Don’t even think of copying the files.
An exclamatory sentence : I repeat, I did not copy the files!
Note,  by  the  way,  that  an  imperative  sentence  doesn’t  need  a  subject.  In  this
instance the pronoun you is clearly implied .
It’s imperative that we have your custom
Imperatives  don’t  have  to  be  bossy,  they  can  be  gently  persuasive,  which  is
probably why advertisers love them:
Let the train take the strain.
Make someone happy with a phone call.