老师的话往往对学生有很大影响,我翻出来是Teachers' words often have great influen

老师的话往往对学生有很大影响,我翻出来是Teachers' words often have great influence on students对吗
中间的have后到底加不加a之类的定冠词,要是不加是因为什么
是用have还是用has