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(+)S + tobe + verb1 + ing + object + now
(-)s + tobe + not + verb1 + ing + object + now
(?)tobe + subject + verb1 + ing + object + now
Past tense:
(+) s + verb2 + object
(-) s + did + verb1 + object
(?) did + s + verb1 + object
continues tense ⇒ subject + to be (is, am, are ) + verb-ing
past tense ⇒ subject + verb₂
perfect tense ⇒ subject + has/have + verb₃
present future tense ⇒ subject + modal (can, will, shall, should, must, may) + verb₁