wait for sb. to do sth.have interest in (doing) sth. /sb.show (great) interest in...in time to do sth.on time to do sth.(请问at the right time是什么意思?at the right time=on time这个说法正确吗?)请问是否有have a lecture?如果有,它和give a lecture有什么区别呢?拜托您了,谢谢!!