1. speak

speak vi．说话；发言...speaker n．说话者；扬声器

2. speech

speech 演说；讲演；说话；言论...contest 竞争；竞赛：比奉

3. talk

talk 说话，讲话，谈话...conversation 着重于两个人的对话，或者一种情景中的对话，（非正式的）交谈，谈话

4. say

He spoke his views in his report.在他的报告中，他表达了他的观点。say 说，说话，讲...What did you say?你刚才说什么?