Sentence Correction (SC) on the GMAT_ PART 7 (Grammar commonly tested on the GMAT)

Grammar commonly tested on the GMAT


1. "Further" vs "Farther"
- Further: commonly used to denote quantity
- Farther: used to denote distance

Examples

   He needs no further supply.
   I have walked farther than you.


2. "Each other" vs "one another"
- Each other: refers to two
- One another: refers to more than two

Examples

        Sarah and Smith love one another (Wrong!)
        Sarah and Smith love each other(Correct)
        Sarah, Smith and Jones  help each other (Wrong!)
        Sarah, Smith and Jones help one another (Correct)
       
3. "Whether" vs "If"
- On the GMAT, we prefer using whether to using if.

Example

         I do not know if he can come
 >>> I do not know whether he can come

4. "Concerned for" vs "Concerned with"
- Concerned for: worried or anxious 
- Concerned with: related to

Examples:

    He hasn't been seen for several days and there is concerned for his safety.
    The book is primarily concerned with the global warming.

5. "Which" vs "That"
-  Which: preceded by comma; can replace a noun,  not a sentence, apply to things, extra information. 
- That: no comma, usually introduces essential information.

Examples

     The thing that amazes me is how wide his interests were.
     I lent him Vietnamese folk songs, which are easy to play
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