An island grammar is a grammar that only describes a small chunk of the underlying language. It is used in language parsing in situations where there is no requirement for checking the entire syntax of a provided text. Island grammars can be extended with the use of a bridge grammar.
Can we infer the following?
Island grammar is used when syntax checking is not required for a tex.t

Pick from:
 *Yes.
 *It's impossible to say.
 *No.
The answer is:
Yes