Reuters 2

The exposed cracked floors of parts of Lake Titicaca, South America’s largest freshwater basin, nestled amid the Andes mountains, are an alarming sight for local farmers and scientists.
 
– What is the subject of this sentence?
The subject of the sentence is the exposed cracked floors of parts of Lake Titicaca.
 
– Is the subject singular or plural?
The exposed cracked floors of parts of Lake Titicaca is a plural subject.
The singular form is floor.
 
– What is/are the tense(s) used in this sentence?
The exposed cracked floors …. are an alarming sight for local farmers and scientists.
Plural subject + are + noun
This is a patter of the present simple tense.
 
– Is this an active or passive sentence?
This sentence does not contain an action verb.
We can only determine whether a sentence uses active or passive voice when there is an action verb and we know who or what is doing the action.
 
– Is there a noun, adjective or adverb clause in this sentence?
The exposed cracked floors of parts of Lake Titicaca, South America’s largest freshwater basin, nestled amid the Andes mountains, are an alarming sight for local farmers and scientists.
 
The core sentence is this:
The exposed cracked floors of parts of Lake Titicaca are an alarming sight for local farmers and scientists.
 
Lake Titicaca
= noun phrase
 
South America’s largest freshwater basin
= appositive (a noun or noun phrase that gives additional information to a noun or noun phrase)
 
nestled amid the Andes mountains
= reduced adjective clause
 
which is nestled amid the Andes mountains
= full adjective clause
 
An adjective clause gives additional information to a noun or noun phrase.
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