Directions: Judge whether each of the following statements is true or false. Put T for true or F for false in the bracket in front of each statement. If you think a statement is false, you must explain why you think so and give the correct version.

Language varieties may be standard and nonstandard. Nonstandard varieties are regarded as substandard languages. Only standard varieties are regarded as the only correct, logical and pure, and are effective in expressing ideas in communication.