How do I diagram this sentence?
And than all of a sudden he could.
I think you mean "then" rather than "than" -- right?
Here are two sites that will help you with diagramming:
http://members.cox.net/teachro/
http://grammar.ccc.commnet.edu/grammar/diagrams/diagrams.htm
Let me know what you come up with.
=)
And then all of a sudden he could.
And - conjunction -- not a good idea to begin sentences with one of these.
then - adverb
all of a sudden - adverbial phrase
he - subject
could - verb
Very strangely worded sentence ... and seems incomplete, too. He could do what??
??