What is the difference between supposed and expected?
For example, which one should be used in the following example?
I am confused about the two words base and basis. I often use one when the other is expected/supposed.
To suppose something means:
To expect something means:
Suppose implies a guess (not what you necessarily think will happen), while expect means that you are pretty sure it will/should happen.
So expect is better in your example:
However, even that implies that a certain person is expecting one or the other, rather than that one or the other would actually fit better. I would say:
I've never seen supposed without being followed by to in such a construction. Generally speaking, supposed is never left without to when it has the sense of expected. In the example you cite, I'd go for expected, though correct would be a better choice.
As for the difference between the two words, they are sometimes used interchangeably:
He isn't expected/supposed to arrive before 9.
However, this isn't always the case, esp with some fixed phrases, like:
How am I supposed to know what you wanted me to do?
What is that supposed to mean?
expected would sound unnatural in these examples.