When children learn to distinguish between the sounds of their language and the sounds that are not part of the language， they can acquire any sounds in their native language once their parents teach them.

判断题If a child is deprived of linguistic environment， he or she is unlikely to learn a language successfully later on.

判断题Language reflects sexism in society. Language itself is not sexist， just as it is not obscene; but it can connote sexist attitudes as well as attitudes about social taboos or racism.

判断题The division of English into Old English， Middle English， and Modern English is nonconventional and not arbitrary.

判断题An important difference between presupposition and entailment is that presupposition，unlike entailment，is not vulnerable to negation. That is to say, if a sentence is negated, the original presupposition is still true.

判断题Linguistic forms having the same sense may have different references in different situations while linguistic forms with the same reference always have the same sense.