.Read the sentence.
Is this the year when the MOON AND SUN WILL ALIGN?
The bolded words are what kind of clause?
Adjective because it describes what they do...?
The bolded words are an adjective clause.
The subordinate clause above is a relative clause as it modifies the noun "year". This is a restrictive adjective clause, which means that if it was removed, the meaning of the sentence would be altered (see a). As you can see, the clause is essential for the meaning of the sentence to be complete.
a) *Is this the year ?
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