Grammar
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Special Agreement Problems:Watch for compound subjects and prepositional phrases when making subjects and verbs agree.

COMPOUND SUBJECTS

When two or more parts of a compound subject are joined by the conjunction and, use the plural form of the verb.

The hiker and the guide are amazed.
Water and steam shoot into the air.

When the parts are joined by or, either/or, or neither/nor, use the form of the verb that agrees with the subject closest to the verb.

Clint or Ross is reading about geysers.
Either these books or that article has good pictures.

PREPOSITIONAL PHRASES AFTER THE SUBJECT

Be careful with prepositional phrases that come between the subject and the verb.  Do not confuse the subject of the verb with the object of the preposition.  Look at this example:

The explanation for geysers is simple.   
What is the sentence about? explanantion
Explanation is the subject of the sentence and is singular.
You use the verb is.

-information from The Writer's Craft page 533.

 

 
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