speak是什么意思?speak过去式,过去分词是什么?

after you speak pay attention to the point, not h

speaktalksaytell都表示说在用法上有哪些区别ketpet英语词汇学习

第三十八讲三分钟弄懂saytellspeaktalk的区别

同样表示"说话",say和speak有什么区别?