(be + present participle) I am sitting, I was sitting The simple modal is formed by the modal auxiliary + infinitive I might sit. I would sit. I must sit.
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canakcwhere do i use modal/ be /ing combination and where do i use modal/be ??There is really no difference between the two. Wherever the version without a modal has am, is, or are, change it to be after a modal. It makes no difference if an -ing word follows; the -ing word won't change.