--Hi, Grammar Greek. I'm a non-native speaker of English teaching English composition to non-native students. Often we must teach English structures grammatically.
What I want to know now is in what cases we should use 'that clause" and "to do".
I must teach my students as simply as possible, so I'm trying to work out a formula, on which we can find which to use between 'that clause" or "to do".
My idea is "to do" expresses Acton and "that clause" expresses Fact or Occurrence".
For example, in D "to play on that street" expresses Action, I think.
D: "It's dangerous to play on that street"
In E "that I succeeded in the test" expresses Fact or Occurrence, I think.
E: "It's fortunate that I succeeded in the test."
But I'm not sure about B / C.
B: I expect to see you tomorrow.
C: I expect that I will see you tomorrow.
A expresses either a desire/wish or a command as you point out.
In my idea a desire/wish or a command is a kind of action, if we divide into 2 factors (Action / Fact or Occurrence) all kinds of things relating to human life.
C expresses a prediction as you say. But strictly, I think "expect --" is a kind of action --- an action of predicting, and "that I will see you tomorrow" expresses a future occurrence or a possible fact.
What I want to know most is whether B is an expression of Action or that of Occurrence / Fact.
Maybe either will do, I think. I'd be glad if you give me some advice or comment.
Or is my idea or attempt awkward?