A subject and its verb must agree in number The subject here is 'life', therefore the verb should be 'is'.
Explanation
Place a period at the close of every declarative sentence and most of imperative sentences.
When - make sure to use this word to refer to time.
A pronoun is in the nominative case when it acts as the 'subject' of the verb. 'They' is in the nominative case here.
An adjective that follows its noun and, like a non-essential appositive, is set off by commas is said to be 'appositive adjective'.
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