Rumus :
(+): S + have/has + been + Ving (-): S + have/has + not + been + Ving (?): Have/has + S + been + Ving
Contoh :
(+) She has been going to Malang since evening.
(-) She hasn’t been going to Malang since evening.
(?) Has she been going to Malang ?
(+) We have been riding a horse for three days
(-) We haven’t been riding a horse for three days.
(?) Have He been riding a horse for three days ?
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