Acquisition of Mother Tongue的用法和样例：
- The rate of markedness relates with the place and methodof articulation, sonorant principle, the universal of the language, and theorder of mother tongue"s acquisition.
- Finally this paper points out the necessity of appropriate application of mother tongue in the FLL classroom.
- We Chinese have a very weak consciousness of the safety of mother tongue, the state of which has now become even worse.
- Starting2001,1 st through4 th grade students will be required to take two hours of mother tongue courses per week; but they are only electives from the5 th grade on.