1. no more than：同样不;仅仅，只有
e.g. This book is no more interesting than that one.
It is no more than empty talk.
not more than：不比……更，不如;至多
e.g. He is not more clever than you are.
There were not more than 5 factories in our city before liberation.
2. on sale：出售的;廉价出售
e.g. Many new farm tools are on sale in this store.
I got this book on sale; it was very cheap.
for sale：出售的，上市的
e.g. I shall put these goods up for sale.
在作“出售的”的意思的时候，on sale和for sale还是有一些不同的，一般来说，for sale多指物主亲自或委托代理人经手出售，而on sale通常表示店里的货物是供出售的。
3. once again：再一次
e.g. I want to try this once again.
once and again：一再
e.g. I have told him once and again not to do that.
4. out of question：毫无疑问，必定
e.g. Out of question, this plan can be fulfilled ahead of time.
out of the question：不可能的
e.g. What you propose is out of the question.
5. refer to：提及，涉及
e.g. I would like to refer back to the first of my three points.
refer to…as：称作，叫做
e.g. Coal is often referred to as food for industry.
