You don't. Good writers don't use synonyms for "he said" or "she said." Writing "he gasped" or "she shuddered" detracts from the writing and jerks the reader out of the story. Instead, show the character gasping.
For example, you might write "Her mouth fell open and she couldn't catch her breath."
The word gasp is a verb. The past tense is gasped.
No, gasped can be a verb form or adjective (gasped breaths, gasped words). There is an adverb (gaspingly) formed from the present participle, gasping.
That is the correct spelling of the word "gasped" (inhaled, as in shock or surprise).
The girl gasped after her teacher went away from her.
I gasped for air after being underwater for a long time.
dialouge
conversation
Gasped
There is one syllable.
Yes, they certainly do.
Well gasped is a verb... so when you're attributing an action to a character or subject you can use it then. Ex. Just as he though he would faint from lack of oxygen, he fought his way to the shore and gasped as though his lungs would never fill.
If you're talking about an essay, it is also called a thesis statement. To write one for and essay: State what you will be talking about in the essay. If you are talking about a story: Use interesting dialouge, an interesting statement, or ask the reader a question.