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??

??

To diagram the sentence "And then all of a sudden he could," you would follow these steps:

1. Identify the main parts of the sentence. In this case, the main parts are "he" (subject) and "could" (verb).
2. Look for any modifiers or additional information. In this sentence, there are two adverbs: "then" and "all of a sudden."
3. Place the subject and verb on a horizontal line, with the subject on the left and the verb on the right.
- Subject: "he"
- Verb: "could"
4. Add the adverbs below the subject and verb, connected with diagonal lines or horizontal lines.
- Adverb: "then"
- Adverb: "all of a sudden"
5. If there are any conjunctions, connect them with a short vertical line between the words they join. However, starting a sentence with a conjunction is not recommended.

After diagramming the sentence, it becomes evident that something is missing, as the sentence seems incomplete. It's unclear what the subject "he" could do.