I'm not sure is this answers your question , but this is what I think you were asking.
These are various statements where on, in and at can be used appropriately.
Past tense:
I was in the super market on Monday.
I was at the mall on Friday.
Present tense:
I am on the bus.
I am at work.
I am on my way home.
Grammar in English is a very important thing. Grammar in any language is important for understanding many people's valuable thoughts.
Grammar Check (In Microsoft Word) can usually find sentence errors or improper use of grammar usage. It underlines words in green, and the green lines will disappear if you fix the error. NOUNPLUS Online Free Grammar Checker of English helps those who engage in academic, professional or creative writing to check grammar, making English grammar rules easier.
The qualifications for an English grammar job is an Ielts or Tofel certification. With 8.5PTS for Ielts or 2000PTS for Tofel, you can get a very good English grammar job.
Texting is ruining children's grammar and English skills.
Grammar is the way a language combines its elements to make sense.
English Grammar In Use was created in 1985.
You use English grammar to form sentences and communicate using the English language.
http://www.edufind.com/english/grammar/
H. W. Davies has written: 'An English grammar for...junior classes' -- subject(s): Grammar, English language 'An English grammar for the use of junior classes' -- subject(s): Grammar, English language
The use of good English grammar.
i have been chating with my friend
use of seem in English grammer
"Gramática" in English means "grammar." It refers to the rules and structures that govern the use of a particular language.
John A. MacCabe has written: 'An English grammar for the use of schools' -- subject(s): Grammar, English language
no not really
so you can make plurals
William Harvey Wells has written: 'The Graded School: A Graded Course of Instruction for Public Schools: with Copious Practical ..' 'A grammar of the English language' -- subject(s): Grammar, English language 'A Grammar of the English Language: For the Use of Schools' -- subject(s): Accessible book 'Wells's school grammar' -- subject(s): Grammar, English language