When to omit a preposition?

Prepositions are not used with certain verbs and expressions. For example, the preposition 'to' is not normally used before the word home. We say 'I am going home', not 'I am going to home'.

1. What should be avoided when using prepositions?
2. How do you identify omitted words?
3. Can I omit the verb to be?

What should be avoided when using prepositions?

Avoid Using Prepositions at the End of Sentences

Because prepositions must be followed by a noun and have an object, they should rarely be placed at the end of a sentence. For example, it's generally not correct to say: #a. The table is where I put my books on.

How do you identify omitted words?

An ellipsis that indicates the omission of one or more words within a sentence consists of three spaced dots. In such cases, in addition to the spaces between the dots, we insert one space before the first ellipsis point and another space after the last dot as well.

Can I omit the verb to be?

THE OMISSIBILITY OF be IN ENGLISH

The verb BE can sometimes be omitted in English without losing grammaticality or changing meaning, just as its equivalent can in many other languages.