Prepositions are short words and phrases that give information about place, time and manner, eg: 'on', 'under', 'near', 'below', 'by', 'at', 'in' You can join sentences, clauses and phrases together ...

This makes the two ideas equal in the sentence - if you take away one part of it, you are left with a simple sentence again. These are very common when speaking and they are not difficult to ...