把下列短语或句子用if连成一句话.
问题描述：
把下列短语或句子用if连成一句话.
1.listen to the teachers carefully,get good grades.
2.We can learn a lot .We listen to the teacher carefully.
答
1.If you listen to the teachers carefully,you'llget good grades.
2.We can learn a lot if we listen to the teacher carefully.