做白日梦的几种常见表达:
1.Don't sit there daydreaming!
别闲着做白日梦。
2.Stop daydreaming, return to reality.
拒绝白日梦，要脚踏实地。
3.I'm a doer, not a day dreamer.
我是一个实干家，不是做白日梦的。
4.Chasing the rainbows
做白日梦，追逐不可能实现的梦想。

做演讲的几种常见表达:
1.give a talk, give lecture, make speeches; give a pseech; present a speech; give an address.
2.I'm delighted/pleased/glad to have the opportunity of making this presentation.
3.The subject of my presentation is...; I shall be speaking today about ...; Today's topic is...