I would like to know which of the below sentences is right to use for present tense-
closed as general reference by RegDwighт♦ Jun 12 '12 at 7:51
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Two things we need to clarify first:
"I'm sick" is right now. But because of the "Be" Verb there it becomes a state that you have ALREADY entered.
You could say "I feel sick" or "I'm feeling sick." Either of them is Ok. Because the Verb "feel," unlike most other Stative Verbs, can be used in V+ing form.
You could also say "I'm STARTING to get/ feel sick" or "I'm getting sick" to emphasize the onset.
As the other answerers mentioned you can't use the -ing form of sick in this context. So the correct version is I am sick. One way where you can use sicking is in sicking something up, which means to throw up or puke.