2- I too/also want to join in the discussion.
My personal view on sentence #2:
a. (Peter wants to join in the discussion.). I, too, want to join in the discussion.
b. (Peter wants to join in the discussion.). I, also, want to join in the discussion.
c. (I want to attend the meeting.) I want to join in the discussion (,
?) too.
d. (I want to attend the meeting.) I also want to join in the discussion.
e. (Peter wants to join in the discussion.). I want to join in the discussion as well.
f. (I want to attend the meeting.) I want to join in the discussion as well.
As you see, there is potential ambiguity, particularly with
e and
f. We can resolve this in
speech with pauses and word stress. In
writing, it is more difficult. Many British people are a little haphazard in the way they use commas, and I can't see how commas can resolve the problem in
e and
f.