试题题干
Judge whether each of the following statements is true or false. Choose "T" for true or "F" for false. Give a correct version for each of the false statements.
The constituents which must be present on the right side of the arrow in a phrase structure rule are called optional constituents.
参考答案
试题解析
The constituents which must be present on the right side of the arrow in a phrase structure rule are called compulsory constituents./ The constituents which may be present or absent on the right side of the arrow in a phrase structure rule are called optional constituents.